diff --git a/README.md b/README.md
index b0c9bc3..1ca9a20 100644
--- a/README.md
+++ b/README.md
@@ -907,6 +907,11 @@ scale snapping, are adapted from CSS Electronics'
 (MIT). The OEM checksum algorithms in `core/checksums.py` follow
 [commaai/opendbc](https://github.com/commaai/opendbc) (MIT).
 
+The NMEA 2000 definitions in `canlab/core/data/n2k_pgns.json` are distilled
+from [CANboat](https://github.com/canboat/canboat) (Apache License 2.0, Kees
+Verruijt) by `tools/build_n2k_table.py`; the licence and the changes made are
+in `canlab/core/data/CANBOAT-NOTICE.txt`.
+
 The SNIFFER tab and its notch, the capture splitter and the GVRET protocol
 follow [SavvyCAN](https://github.com/collin80/SavvyCAN) (MIT), whose sniffer
 window and Bisector are the originals and whose source documents the GVRET
diff --git a/canlab.spec b/canlab.spec
index d2cb1e5..4fce780 100644
--- a/canlab.spec
+++ b/canlab.spec
@@ -20,6 +20,8 @@ a = Analysis(
         (str(ROOT / "canlab.png"),             "canlab"             ),
         (str(ROOT / "assets"),                 "canlab/assets"      ),
         (str(ROOT / "sample_data"),            "canlab/sample_data" ),
+        # the NMEA 2000 table distilled from canboat, and its licence notice
+        (str(ROOT / "core" / "data"),          "canlab/core/data"   ),
         *pil_datas,
     ],
     hiddenimports=[
diff --git a/canlab/core/data/CANBOAT-NOTICE.txt b/canlab/core/data/CANBOAT-NOTICE.txt
new file mode 100644
index 0000000..f448579
--- /dev/null
+++ b/canlab/core/data/CANBOAT-NOTICE.txt
@@ -0,0 +1,40 @@
+canlab/core/data/n2k_pgns.json is derived from docs/canboat.json in
+CANboat, https://github.com/canboat/canboat
+
+CANboat version v8.2.1
+
+(C) 2009-2026, Kees Verruijt, Harlingen, The Netherlands.
+For more information see https://github.com/canboat/canboat
+
+This file is part of CANboat.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+
+
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Changes: kept each standard PGN's name, frame type and fixed-position
+fields, and the lookup tables those fields use; dropped proprietary
+PGNs and fields whose position depends on earlier variable-length data.
diff --git a/canlab/core/data/n2k_pgns.json b/canlab/core/data/n2k_pgns.json
new file mode 100644
index 0000000..24b3d74
--- /dev/null
+++ b/canlab/core/data/n2k_pgns.json
@@ -0,0 +1 @@
+{"source":"canboat 8.2.1","licence":"Apache-2.0, see CANBOAT-NOTICE.txt","pgns":{"59904":{"name":"ISO Request","fast":false,"fields":[["PGN",0,24,1,false,"","PGN",0,262143,0,""]]},"60160":{"name":"ISO Transport Protocol, Data Transfer","fast":false,"fields":[["SID",0,8,1,false,"","NUMBER",0,252,0,""]]},"60928":{"name":"ISO Address Claim","fast":false,"fields":[["Unique Number",0,21,1,false,"","NUMBER",0,2097148,0,""],["Manufacturer Code",21,11,1,false,"","LOOKUP",0,2044,0,"MANUFACTURER_CODE"],["Device Instance Lower",32,3,1,false,"","NUMBER",0,7,0,""],["Device Instance Upper",35,5,1,false,"","NUMBER",0,31,0,""],["Device Function",40,8,1,false,"","INDIRECT_LOOKUP",0,252,0,""],["Device Class",49,7,1,false,"","LOOKUP",0,125,0,"DEVICE_CLASS"],["System Instance",56,4,1,false,"","NUMBER",0,13,0,""],["Industry Group",60,3,1,false,"","LOOKUP",0,6,0,"INDUSTRY_CODE"],["Arbitrary address capable",63,1,1,false,"","LOOKUP",0,1,0,"YES_NO_1BIT"]]},"61440":{"name":"0xF000-0xFEFF: Standardized single-frame non-addressed","fast":false,"fields":[["Manufacturer Code",0,11,1,false,"","LOOKUP",0,2044,0,"MANUFACTURER_CODE"],["Industry Code",13,3,1,false,"","LOOKUP",0,6,0,"INDUSTRY_CODE"]]},"65001":{"name":"Bus #1 Phase C Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""]]},"65002":{"name":"Bus #1 Phase B Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""]]},"65003":{"name":"Bus #1 Phase A Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""]]},"65004":{"name":"Bus #1 Average Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""]]},"65005":{"name":"Utility Total AC Energy","fast":false,"fields":[["Total Energy Export",0,32,1,false,"kWh","NUMBER",0,4294967292,0,""],["Total Energy Import",32,32,1,false,"kWh","NUMBER",0,4294967292,0,""]]},"65006":{"name":"Utility Phase C AC Reactive Power","fast":false,"fields":[["Reactive Power",0,16,1,false,"VAR","NUMBER",0,65532,0,""],["Power factor",16,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",32,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65007":{"name":"Utility Phase C AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65008":{"name":"Utility Phase C Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"65009":{"name":"Utility Phase B AC Reactive Power","fast":false,"fields":[["Reactive Power",0,16,1,false,"VAR","NUMBER",0,65532,0,""],["Power factor",16,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",32,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65010":{"name":"Utility Phase B AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65011":{"name":"Utility Phase B Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"65012":{"name":"Utility Phase A AC Reactive Power","fast":false,"fields":[["Reactive Power",0,32,1,true,"VAR","NUMBER",-2000000000,2294967292,-2000000000,""],["Power factor",32,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",48,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65013":{"name":"Utility Phase A AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65014":{"name":"Utility Phase A Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"65015":{"name":"Utility Total AC Reactive Power","fast":false,"fields":[["Reactive Power",0,32,1,true,"VAR","NUMBER",-2000000000,2294967292,-2000000000,""],["Power factor",32,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",48,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65016":{"name":"Utility Total AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65017":{"name":"Utility Average Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"65018":{"name":"Generator Total AC Energy","fast":false,"fields":[["Total Energy Export",0,32,1,false,"kWh","NUMBER",0,4294967292,0,""],["Total Energy Import",32,32,1,false,"kWh","NUMBER",0,4294967292,0,""]]},"65019":{"name":"Generator Phase C AC Reactive Power","fast":false,"fields":[["Reactive Power",0,32,1,true,"VAR","NUMBER",-2000000000,2294967292,-2000000000,""],["Power factor",32,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",48,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65020":{"name":"Generator Phase C AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65021":{"name":"Generator Phase C Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"65022":{"name":"Generator Phase B AC Reactive Power","fast":false,"fields":[["Reactive Power",0,32,1,true,"VAR","NUMBER",-2000000000,2294967292,-2000000000,""],["Power factor",32,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",48,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65023":{"name":"Generator Phase B AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65024":{"name":"Generator Phase B Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"65025":{"name":"Generator Phase A AC Reactive Power","fast":false,"fields":[["Reactive Power",0,32,1,true,"VAR","NUMBER",-2000000000,2294967292,-2000000000,""],["Power factor",32,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",48,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65026":{"name":"Generator Phase A AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65027":{"name":"Generator Phase A Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"65028":{"name":"Generator Total AC Reactive Power","fast":false,"fields":[["Reactive Power",0,32,1,true,"VAR","NUMBER",-2000000000,2294967292,-2000000000,""],["Power factor",32,16,6.103515625e-05,false,"Cos Phi","NUMBER",0,3.999755859375,0,""],["Power Factor Lagging",48,2,1,false,"","LOOKUP",0,2,0,"POWER_FACTOR"]]},"65029":{"name":"Generator Total AC Power","fast":false,"fields":[["Real Power",0,32,1,true,"W","NUMBER",-2000000000,2294967292,-2000000000,""],["Apparent Power",32,32,1,true,"VA","NUMBER",-2000000000,2294967292,-2000000000,""]]},"65030":{"name":"Generator Average Basic AC Quantities","fast":false,"fields":[["Line-Line AC RMS Voltage",0,16,1,false,"V","NUMBER",0,65532,0,""],["Line-Neutral AC RMS Voltage",16,16,1,false,"V","NUMBER",0,65532,0,""],["AC Frequency",32,16,0.0078125,false,"Hz","NUMBER",0,511.96875,0,""],["AC RMS Current",48,16,1,false,"A","NUMBER",0,65532,0,""]]},"126464":{"name":"PGN List (Transmit and Receive)","fast":true,"fields":[["Function Code",0,8,1,false,"","LOOKUP",0,252,0,"PGN_LIST_FUNCTION"]]},"126983":{"name":"Alert","fast":true,"fields":[["Alert Type",0,4,1,false,"","LOOKUP",0,13,0,"ALERT_TYPE"],["Alert Category",4,4,1,false,"","LOOKUP",0,13,0,"ALERT_CATEGORY"],["Alert System",8,8,1,false,"","NUMBER",0,252,0,""],["Alert Sub-System",16,8,1,false,"","NUMBER",0,252,0,""],["Alert ID",24,16,1,false,"","NUMBER",0,65532,0,""],["Data Source Instance",104,8,1,false,"","NUMBER",0,252,0,""],["Data Source Index-Source",112,8,1,false,"","NUMBER",0,252,0,""],["Alert Occurrence Number",120,8,1,false,"","NUMBER",0,252,0,""],["Temporary Silence Status",128,1,1,false,"","LOOKUP",0,1,0,"YES_NO_1BIT"],["Acknowledge Status",129,1,1,false,"","LOOKUP",0,1,0,"YES_NO_1BIT"],["Escalation Status",130,1,1,false,"","LOOKUP",0,1,0,"YES_NO_1BIT"],["Temporary Silence Support",131,1,1,false,"","LOOKUP",0,1,0,"YES_NO_1BIT"],["Acknowledge Support",132,1,1,false,"","LOOKUP",0,1,0,"YES_NO_1BIT"],["Escalation Support",133,1,1,false,"","LOOKUP",0,1,0,"YES_NO_1BIT"],["Trigger Condition",200,4,1,false,"","LOOKUP",0,13,0,"ALERT_TRIGGER_CONDITION"],["Threshold Status",204,4,1,false,"","LOOKUP",0,13,0,"ALERT_THRESHOLD_STATUS"],["Alert Priority",208,8,1,false,"","NUMBER",0,252,0,""],["Alert State",216,8,1,false,"","LOOKUP",0,252,0,"ALERT_STATE"]]},"126984":{"name":"Alert Response","fast":true,"fields":[["Alert Type",0,4,1,false,"","LOOKUP",0,13,0,"ALERT_TYPE"],["Alert Category",4,4,1,false,"","LOOKUP",0,13,0,"ALERT_CATEGORY"],["Alert System",8,8,1,false,"","NUMBER",0,252,0,""],["Alert Sub-System",16,8,1,false,"","NUMBER",0,252,0,""],["Alert ID",24,16,1,false,"","NUMBER",0,65532,0,""],["Data Source Instance",104,8,1,false,"","NUMBER",0,252,0,""],["Data Source Index-Source",112,8,1,false,"","NUMBER",0,252,0,""],["Alert Occurrence Number",120,8,1,false,"","NUMBER",0,252,0,""],["Response Command",192,2,1,false,"","LOOKUP",0,3,0,"ALERT_RESPONSE_COMMAND"]]},"126985":{"name":"Alert Text","fast":true,"fields":[["Alert Type",0,4,1,false,"","LOOKUP",0,13,0,"ALERT_TYPE"],["Alert Category",4,4,1,false,"","LOOKUP",0,13,0,"ALERT_CATEGORY"],["Alert System",8,8,1,false,"","NUMBER",0,252,0,""],["Alert Sub-System",16,8,1,false,"","NUMBER",0,252,0,""],["Alert ID",24,16,1,false,"","NUMBER",0,65532,0,""],["Data Source Instance",104,8,1,false,"","NUMBER",0,252,0,""],["Data Source Index-Source",112,8,1,false,"","NUMBER",0,252,0,""],["Alert Occurrence Number",120,8,1,false,"","NUMBER",0,252,0,""],["Language 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Industries","796":"Canadian Automotive","797":"Tides Marine","798":"Lumishore","799":"Still Water Designs and Audio","802":"BJ Technologies (Beneteau)","803":"Gill Sensors","811":"Blue Water Desalination","815":"FLIR","824":"Undheim Systems","826":"Lewmar","838":"TeamSurv","844":"Fell Marine","847":"Oceanvolt","862":"Prospec","868":"Data Panel","890":"L3 Technologies","894":"Rhodan Marine Systems","896":"Nexfour Solutions","905":"ASA Electronics","909":"Marines Co (South Korea)","911":"Nautic-on","917":"Sentinel","929":"JL Marine Systems","930":"Ecotronix","944":"Zontisa Marine","951":"EXOR International","962":"Timbolier Industries","963":"TJC Micro","968":"Cox Powertrain","969":"Blue Seas","981":"Kobelt Manufacturing","992":"Blue Ocean IOT","997":"Xenta Systems","999":"Signal K","1004":"Ultraflex","1008":"Lintest SmartBoat","1011":"Soundmax","1020":"Team Italia Marine (Onyx Marine Automation s.r.l)","1021":"Entratech","1022":"ITC","1029":"The Marine Guardian","1047":"Sonic","1051":"ProNav","1053":"Vetus Maxwell INC.","1056":"Lithium Pros","1059":"Boatrax","1062":"Marol Co ltd","1065":"CALYPSO Instruments","1066":"Spot Zero Water","1069":"Lithionics Battery","1070":"Quick-teck Electronics","1075":"Uniden America","1083":"Nauticoncept","1084":"Shadow-Caster LED lighting","1085":"Wet Sounds","1088":"E-T-A Circuit Breakers","1092":"Scheiber","1100":"Smart Yachts International Limited","1109":"Dockmate","1114":"Bobs Machine","1118":"L3Harris ASV","1119":"Balmar","1120":"Elettromedia","1127":"Electromaax","1140":"Across Oceans Systems","1145":"Kiwi Yachting","1150":"BSB Artificial Intelligence","1151":"Orca Technologies","1154":"TBS Electronics","1158":"Technoton Electroics","1160":"MG Energy Systems","1169":"Sea Machine Robotics","1171":"Vista Manufacturing","1183":"Zipwake","1186":"Sailmon","1192":"Airmoniq Pro Kft","1194":"Sierra Marine","1200":"Xinuo Information Technology (Xiamen)","1218":"Septentrio","1233":"NKE Marine Electronics","1238":"SuperTrack Aps","1239":"Honda Electronics","1245":"Raritan Engineering","1249":"Integrated Power Solutions AG","1260":"Interactive Technologies","1283":"LTG-Tech","1299":"Energy Solutions (UK)","1300":"WATT Fuel Cell","1302":"Pro Mainer","1305":"Dragonfly Energy","1306":"Koden Electronics","1311":"Humphree","1316":"Hinkley Yachts","1317":"Global Marine Management GmbH (GMM)","1320":"Triskel Marine","1330":"Warwick Control Technologies","1331":"Dolphin Charger","1337":"Barnacle Systems","1348":"Radian IoT","1353":"Ocean LED Marine","1359":"BluNav","1361":"OVA (Nantong Saiyang Electronics Co., Ltd)","1368":"RAD Propulsion","1369":"Electric Yacht","1372":"Elco Motor Yachts","1384":"Tecnoseal Foundry S.r.l","1385":"Pro Charging Systems","1389":"EVEX","1398":"Gobius Sensor Technology","1403":"Arco Marine","1408":"Lenco Marine","1413":"Naocontrol","1417":"Revatek","1438":"Aeolionics","1439":"PredictWind","1440":"Egis Mobile Electric","1445":"Starboard Yacht Group","1446":"Roswell Marine","1451":"ePropulsion (Guangdong ePropulsion Technology Ltd.)","1452":"Micro-Air","1453":"Vital Battery","1458":"Ride Controller","1460":"Tocaro Blue","1461":"Vanquish Yachts","1471":"FT Technologies","1478":"Alps Alpine","1481":"E-Force Marine","1482":"CMC Marine","1483":"Nanjing Sandemarine Information Technology","1850":"Teleflex Marine (SeaStar Solutions)","1851":"Raymarine","1852":"Navionics","1853":"Japan Radio","1854":"Northstar Technologies","1855":"Furuno","1856":"Trimble","1857":"Simrad","1858":"Litton","1859":"Kvasar","1860":"MMP","1861":"Vector Cantech","1862":"Yamaha Marine","1863":"Faria Instruments"},"MARK_TYPE":{"0":"Collision","1":"Turning point","2":"Reference","3":"Wheelover","4":"Waypoint"},"MOB_POSITION_SOURCE":{"0":"Position estimated by the vessel","1":"Position reported by MOB emitter"},"MOB_STATUS":{"0":"MOB Emitter Activated","1":"Manual on-board MOB Button Activation","2":"Test mode","3":"MOB Not Active"},"NAV_STATUS":{"0":"Under way using engine","1":"At anchor","2":"Not under command","3":"Restricted maneuverability","4":"Constrained by her draught","5":"Moored","6":"Aground","7":"Engaged in Fishing","8":"Under way sailing","9":"Hazardous material - High Speed","10":"Hazardous material - Wing in Ground","11":"Power-driven vessel towing astern","12":"Power-driven vessel pushing ahead or towing alongside","14":"AIS-SART"},"OFF_ON":{"0":"Off","1":"On"},"OFF_ON_CONTROL":{"0":"Off","1":"On","2":"Reserved","3":"Take no action (no change)"},"OK_WARNING":{"0":"OK","1":"Warning"},"PGN_LIST_FUNCTION":{"0":"Transmit PGN list","1":"Receive PGN list"},"POSITION_ACCURACY":{"0":"Low","1":"High"},"POSITION_FIX_DEVICE":{"0":"Default: undefined","1":"GPS","2":"GLONASS","3":"Combined GPS/GLONASS","4":"Loran-C","5":"Chayka","6":"Integrated navigation system","7":"Surveyed","8":"Galileo"},"POWER_FACTOR":{"0":"Leading","1":"Lagging","2":"Error"},"POWER_MODE":{"0":"High","1":"Low"},"PRESSURE_SOURCE":{"0":"Atmospheric","1":"Water","2":"Steam","3":"Compressed Air","4":"Hydraulic","5":"Filter","6":"AltimeterSetting","7":"Oil","8":"Fuel"},"RAIM_FLAG":{"0":"not in use","1":"in use"},"RANGE_RESIDUAL_MODE":{"0":"Range residuals were used to calculate data","1":"Range residuals were calculated after the position"},"REPEAT_INDICATOR":{"0":"Initial","1":"First retransmission","2":"Second retransmission","3":"Final retransmission"},"REPORTING_INTERVAL":{"0":"As given by the autonomous mode","1":"10 min","2":"6 min","3":"3 min","4":"1 min","5":"30 sec","6":"15 sec","7":"10 sec","8":"5 sec","9":"2 sec (not applicable to Class B CS)","10":"Next shorter reporting interval","11":"Next longer reporting interval"},"RESIDUAL_MODE":{"0":"Autonomous","1":"Differential enhanced","2":"Estimated","3":"Simulator","4":"Manual"},"RODE_TYPE":{"0":"Chain presently detected","1":"Rope presently detected"},"SERIAL_BIT_RATE":{"0":"25","1":"50","2":"100","3":"200","4":"300","5":"600","6":"1200","7":"2400","8":"4800","9":"9600","10":"19200","11":"38400","12":"57600"},"SERIAL_DETECTION_MODE":{"0":"Auto bit rate","1":"Manual bit rate"},"SHIP_TYPE":{"0":"Unavailable","20":"Wing In Ground","21":"Wing In Ground (hazard cat X)","22":"Wing In Ground (hazard cat Y)","23":"Wing In Ground (hazard cat Z)","24":"Wing In Ground (hazard cat OS)","29":"Wing In Ground (no additional information)","30":"Fishing","31":"Towing","32":"Towing exceeds 200m or wider than 25m","33":"Engaged in dredging or underwater operations","34":"Engaged in diving operations","35":"Engaged in military operations","36":"Sailing","37":"Pleasure","40":"High speed craft","41":"High speed craft (hazard cat X)","42":"High speed craft (hazard cat Y)","43":"High speed craft (hazard cat Z)","44":"High speed craft (hazard cat OS)","49":"High speed craft (no additional information)","50":"Pilot vessel","51":"SAR","52":"Tug","53":"Port tender","54":"Anti-pollution","55":"Law enforcement","56":"Spare","57":"Spare #2","58":"Medical","59":"Ships and aircraft of States not parties to an armed conflict","60":"Passenger ship","61":"Passenger ship (hazard cat X)","62":"Passenger ship (hazard cat Y)","63":"Passenger ship (hazard cat Z)","64":"Passenger ship (hazard cat OS)","69":"Passenger ship (no additional information)","70":"Cargo ship","71":"Cargo ship (hazard cat X)","72":"Cargo ship (hazard cat Y)","73":"Cargo ship (hazard cat Z)","74":"Cargo ship (hazard cat OS)","79":"Cargo ship (no additional information)","80":"Tanker","81":"Tanker (hazard cat X)","82":"Tanker (hazard cat Y)","83":"Tanker (hazard cat Z)","84":"Tanker (hazard cat OS)","89":"Tanker (no additional information)","90":"Other","91":"Other (hazard cat X)","92":"Other (hazard cat Y)","93":"Other (hazard cat Z)","94":"Other (hazard cat OS)","99":"Other (no additional information)"},"SPEED_TYPE":{"0":"Single speed","1":"Dual speed","2":"Proportional speed"},"STATION_HEALTH":{"0":"Not Working","1":"Unmonitored","2":"Healthy Operational","3":"Healthy Test Mode","4":"Test Mode"},"STATION_TYPE":{"0":"All types of mobile station","2":"All types of Class B mobile station","3":"SAR airborne mobile station","4":"AtoN station","5":"Class B CS shipborne mobile station","6":"Inland waterways","7":"Regional use 7","8":"Regional use 8","9":"Regional use 9"},"STEERING_MODE":{"0":"Main Steering","1":"Non-Follow-Up Device","2":"Follow-Up Device","3":"Heading Control Standalone","4":"Heading Control","5":"Track Control"},"SYSTEM_TIME":{"0":"GPS","1":"GLONASS","2":"Radio Station","3":"Local Cesium clock","4":"Local Rubidium clock","5":"Local Crystal clock"},"TANK_TYPE":{"0":"Fuel","1":"Water","2":"Gray water","3":"Live well","4":"Oil","5":"Black water"},"TARGET_ACQUISITION":{"0":"Manual","1":"Automatic"},"TELEPHONE_MODE":{"0":"F3E/G3E simplex, telephone","1":"F3E/G3E duplex, telephone","2":"J3E, telephone","3":"H3E, telephone","4":"F1B/J2B FEC NBDP, telex/teleprinter","5":"F1B/J2B ARQ NBDP, telex/teleprinter","6":"F1B/J2B receive only, teleprinter/DSC","7":"F1B/J2B, teleprinter/DSC","8":"A1A Morse, tape recorder","9":"A1A Morse, Morse key/head set","10":"F1C/F2C/F3C, FAX machine"},"TEMPERATURE_SOURCE":{"0":"Sea Temperature","1":"Outside Temperature","2":"Inside Temperature","3":"Engine Room Temperature","4":"Main Cabin Temperature","5":"Live Well Temperature","6":"Bait Well Temperature","7":"Refrigeration Temperature","8":"Heating System Temperature","9":"Dew Point Temperature","10":"Apparent Wind Chill Temperature","11":"Theoretical Wind Chill Temperature","12":"Heat Index Temperature","13":"Freezer Temperature","14":"Exhaust Gas Temperature","15":"Shaft Seal Temperature"},"THRUSTER_DIRECTION_CONTROL":{"0":"Off","1":"Ready","2":"To Port","3":"To Starboard"},"THRUSTER_MOTOR_TYPE":{"0":"12VDC","1":"24VDC","2":"48VDC","3":"24VAC","4":"Hydraulic"},"THRUSTER_RETRACT_CONTROL":{"0":"Off","1":"Extend","2":"Retract"},"TIDE":{"0":"Falling","1":"Rising"},"TIME_STAMP":{"60":"Not available","61":"Manual input mode","62":"Dead reckoning mode","63":"Positioning system is inoperative"},"TRACKING":{"0":"Cancelled","1":"Acquiring","2":"Tracking","3":"Lost"},"TURN_MODE":{"0":"Rudder limit controlled","1":"Turn rate controlled","2":"Radius controlled"},"TX_RX_MODE":{"0":"Tx A/Tx B, Rx A/Rx B","1":"Tx A, Rx A/Rx B","2":"Tx B, Rx A/Rx B"},"VIDEO_PROTOCOLS":{"0":"PAL","1":"NTSC"},"WATERMAKER_STATE":{"0":"Stopped","1":"Starting","2":"Running","3":"Stopping","4":"Flushing","5":"Rinsing","6":"Initiating","7":"Manual"},"WATER_REFERENCE":{"0":"Paddle wheel","1":"Pitot tube","2":"Doppler","3":"Correlation (ultra sound)","4":"Electro Magnetic"},"WINDLASS_DIRECTION":{"0":"Off","1":"Down","2":"Up"},"WINDLASS_MOTION":{"0":"Windlass stopped","1":"Deployment occurring","2":"Retrieval occurring"},"WIND_REFERENCE":{"0":"True (ground referenced to North)","1":"Magnetic (ground referenced to Magnetic North)","2":"Apparent","3":"True (boat referenced)","4":"True (water referenced)"},"YES_NO":{"0":"No","1":"Yes"},"YES_NO_1BIT":{"0":"No","1":"Yes"},"ZONE_SIZE":{"0":"1 nm","1":"2 nm","2":"3 nm","3":"4 nm","4":"5 nm","5":"6 nm"}},"skipped":{"proprietary":126,"ambiguous":4}}
\ No newline at end of file
diff --git a/canlab/core/j1939.py b/canlab/core/j1939.py
index 9460880..32dfcb0 100644
--- a/canlab/core/j1939.py
+++ b/canlab/core/j1939.py
@@ -69,7 +69,7 @@ def parse_j1939_id(arb_id: int) -> dict:
         da  = ps
 
     if is_nmea2000(pgn):
-        _name, single = _N2K_NAMES.get(pgn, (f"PGN {pgn}", True))
+        single = n2k_single_frame(pgn)
         return {
             "priority": priority,
             "pgn":      pgn,
@@ -100,7 +100,15 @@ def parse_j1939_id(arb_id: int) -> dict:
 def pgn_name(pgn: int) -> str:
     """The name of a PGN in whichever table owns it, or a placeholder."""
     if is_nmea2000(pgn):
-        return _N2K_NAMES.get(pgn, (f"PGN {pgn}", True))[0]
+        if pgn in _N2K_NAMES:
+            return _N2K_NAMES[pgn][0]
+        from canlab.core import n2k_db
+        found = n2k_db.name(pgn)
+        if found:
+            return found
+        if 130816 <= pgn <= 131071 or pgn == 126720:
+            return "Proprietary fast packet (manufacturer defined)"
+        return f"PGN {pgn}"
     entry = PGNS.get(pgn)
     if entry is not None:
         return entry.name
@@ -321,25 +329,51 @@ def _decode_satellites_in_view(data: bytes) -> dict:
 }
 
 
-def decode_n2k(pgn: int, data: bytes) -> dict:
+def n2k_single_frame(pgn: int) -> bool:
+    """Whether an NMEA 2000 PGN fits one frame; unknown ones are assumed to."""
+    if pgn in _N2K_NAMES:
+        return _N2K_NAMES[pgn][1]
+    from canlab.core import n2k_db
+    fast = n2k_db.is_fast_packet(pgn)
+    return True if fast is None else not fast
+
+
+def decode_n2k(pgn: int, data: bytes, reassembled: bool | None = None) -> dict:
     """Decode an NMEA 2000 PGN into {field: (value, unit)}.
 
-    Single-frame PGNs decode from their one frame. Fast-packet PGNs decode
-    only from a reassembled buffer longer than a frame; see _N2K_DECODERS.
+    The hand-written decoders, checked against frames from a real marine
+    recording, come first. Every other standard PGN is decoded from the table
+    distilled from canboat (core/n2k_db.py); on that same recording the two
+    agree on every value they share.
+
+    A fast-packet PGN is decoded only from a reassembled message: its single
+    frames carry a sequence byte and a length byte, so reading one alone
+    shifts every field. ``reassembled`` says which one ``data`` is; left as
+    None, a buffer longer than a frame is taken to be reassembled.
     """
+    data = bytes(data)
+    if reassembled is None:
+        reassembled = len(data) > 8
     decoder = _N2K_DECODERS.get(pgn)
     if decoder is not None:
-        return decoder(bytes(data)) if len(data) > 8 else {}
+        return decoder(data) if reassembled else {}
     fields = _N2K_FIELDS.get(pgn)
-    if not fields:
+    if fields:
+        out = {}
+        for name, (start, length, scale, offset, unit, signed) in fields.items():
+            raw = _n2k_value(data, start, length, signed)
+            if raw is None:
+                continue
+            # Rounded to the field's own resolution. A fixed six places turned
+            # a rate of turn of -0.0001047 rad/s into -0.000105 and cut a
+            # 1e-7 degree position to ten centimetres.
+            from canlab.core.n2k_db import _places
+            out[name] = (round(raw * scale + offset, _places(scale)), unit)
+        return out
+    if not n2k_single_frame(pgn) and not reassembled:
         return {}
-    out = {}
-    for name, (start, length, scale, offset, unit, signed) in fields.items():
-        raw = _n2k_value(data, start, length, signed)
-        if raw is None:
-            continue
-        out[name] = (round(raw * scale + offset, 6), unit)
-    return out
+    from canlab.core import n2k_db
+    return n2k_db.decode(pgn, data)
 
 
 # FMI (Failure Mode Identifier) short names — SAE J1939-73 Appendix A.
@@ -390,7 +424,7 @@ def decode_dm1(data: bytes) -> dict:
     return {"lamps": lamps, "dtcs": dtcs}
 
 
-def decode_pgn(pgn: int, data: bytes) -> dict:
+def decode_pgn(pgn: int, data: bytes, reassembled: bool | None = None) -> dict:
     """
     Decode the parameters of one message. Returns {name: (value, unit)}.
 
@@ -404,7 +438,7 @@ def decode_pgn(pgn: int, data: bytes) -> dict:
     PGNs by decode_n2k.
     """
     if is_nmea2000(pgn):
-        return decode_n2k(pgn, data)
+        return decode_n2k(pgn, data, reassembled)
     if pgn == 0xFECA:
         return decode_dm1(data)
     entry = PGNS.get(pgn)
diff --git a/canlab/core/multiframe.py b/canlab/core/multiframe.py
index dd76b02..ec6882b 100644
--- a/canlab/core/multiframe.py
+++ b/canlab/core/multiframe.py
@@ -61,8 +61,17 @@
 MAX_FAST_PACKET_BYTES = 223
 
 #: NMEA 2000 PGNs the name table marks as multi-frame.
-FAST_PACKET_PGNS = frozenset(pgn for pgn, (_name, single) in _N2K_NAMES.items()
-                             if not single)
+def _fast_packet_pgns() -> frozenset:
+    """Every NMEA 2000 PGN sent as a fast packet: the hand-written table's,
+    and every other standard one canboat lists, so a message is reassembled
+    whether or not CanLab can decode it."""
+    from canlab.core import n2k_db
+    hand = {pgn for pgn, (_name, single) in _N2K_NAMES.items() if not single}
+    single = {pgn for pgn, (_name, s) in _N2K_NAMES.items() if s}
+    return frozenset(hand | (n2k_db.fast_packet_pgns() - single))
+
+
+FAST_PACKET_PGNS = _fast_packet_pgns()
 
 
 @dataclass
@@ -476,7 +485,7 @@ def summarize(messages) -> list[dict]:
             "bytes": last.size, "frames": last.frames,
             "first_t": items[0].t_start, "last_t": last.t_end,
             "last_data_hex": last.data.hex(" ").upper(),
-            "decoded": decode_pgn(pgn, last.data),
+            "decoded": decode_pgn(pgn, last.data, reassembled=True),
         })
     rows.sort(key=lambda r: (-r["count"], r["pgn"], r["sa"]))
     return rows
diff --git a/canlab/core/n2k_db.py b/canlab/core/n2k_db.py
new file mode 100644
index 0000000..778dd5f
--- /dev/null
+++ b/canlab/core/n2k_db.py
@@ -0,0 +1,133 @@
+"""Decode any standard NMEA 2000 PGN from the table distilled from canboat.
+
+The table (core/data/n2k_pgns.json, built by tools/build_n2k_table.py from
+canboat, Apache License 2.0) gives each field's position, width, resolution,
+sign, unit and valid range. The range is what makes the decode honest: an
+eight-bit field is valid to 252, and 253, 254 and 255 mean reserved, error
+and not available, as they do throughout NMEA 2000. A value outside its
+range is therefore never shown as a reading.
+
+The hand-written decoders in core/j1939.py are checked against real frames
+and take precedence; this covers the rest. Where both exist, the tests
+require them to agree field by field on the real marine recording.
+
+Temperatures are converted from kelvin to degrees Celsius so they read the
+same as the hand-written ones. Angles stay in radians, as NMEA 2000 sends
+them and as the rest of CanLab reports them.
+"""
+from __future__ import annotations
+
+import datetime as _dt
+import json
+from functools import lru_cache
+from pathlib import Path
+
+DATA = Path(__file__).resolve().parent / "data" / "n2k_pgns.json"
+
+
+@lru_cache(maxsize=1)
+def table() -> dict:
+    try:
+        return json.loads(DATA.read_text(encoding="utf-8"))
+    except (OSError, ValueError):
+        return {"pgns": {}, "lookups": {}}
+
+
+def definition(pgn: int) -> dict | None:
+    return table()["pgns"].get(str(pgn))
+
+
+def name(pgn: int) -> str | None:
+    d = definition(pgn)
+    return d["name"] if d else None
+
+
+def is_fast_packet(pgn: int) -> bool | None:
+    d = definition(pgn)
+    return d["fast"] if d else None
+
+
+def fast_packet_pgns() -> frozenset:
+    return frozenset(int(p) for p, d in table()["pgns"].items() if d["fast"])
+
+
+def _places(resolution: float) -> int:
+    """Decimal places worth keeping for a field of this resolution.
+
+    A fixed six places cut a 1e-16 degree longitude to six centimetres and
+    padded a 0.1 kelvin temperature with float noise; this keeps two places
+    beyond the resolution, up to what a double can hold.
+    """
+    import math
+    if resolution <= 0:
+        return 6
+    return int(min(12, max(0, math.ceil(-math.log10(resolution)) + 2)))
+
+
+def _raw(data: bytes, bit: int, bits: int) -> int | None:
+    if bit + bits > len(data) * 8:
+        return None
+    return (int.from_bytes(bytes(data), "little") >> bit) & ((1 << bits) - 1)
+
+
+def decode(pgn: int, data: bytes) -> dict:
+    """{field: (value, unit)} for a standard PGN, or {} if it is not in the table.
+
+    Not-available and reserved values are left out; an error code is the
+    string "error".
+    """
+    d = definition(pgn)
+    if d is None:
+        return {}
+    lookups = table()["lookups"]
+    out: dict = {}
+    for (fname, bit, bits, res, signed, unit, kind, lo, hi, offset, lookup) in d["fields"]:
+        if fname in ("SID", "Reserved"):
+            continue                     # a sequence number, not a reading
+        raw = _raw(data, bit, bits)
+        if raw is None:
+            continue
+        if kind == "STRING_FIX":
+            text = bytes(data)[bit // 8:(bit + bits) // 8]
+            text = text.rstrip(b"\xff\x00 @").decode("ascii", "replace")
+            if text:
+                out[fname] = (text, "")
+            continue
+        all_ones = (1 << bits) - 1
+        if signed:
+            top = (1 << (bits - 1)) - 1
+            if raw == top:
+                continue                 # not available
+            if raw == top - 1 and bits >= 4:
+                out[fname] = ("error", "")
+                continue
+            if raw > top:
+                raw -= 1 << bits
+        else:
+            if raw == all_ones and bits >= 2:
+                continue
+            if raw == all_ones - 1 and bits >= 4:
+                out[fname] = ("error", "")
+                continue
+        if kind in ("LOOKUP", "INDIRECT_LOOKUP") and lookup:
+            label = lookups.get(lookup, {}).get(str(raw))
+            if label is not None:
+                out[fname] = (label, "")
+            elif hi is None or raw <= hi:
+                out[fname] = (f"unknown ({raw})", "")
+            continue
+        value = raw * res + (offset or 0)
+        if hi is not None and value > hi * (1 + 1e-9) + 1e-9:
+            continue                     # a reserved code
+        if lo is not None and value < lo * (1 + 1e-9) - 1e-9 and not signed:
+            continue
+        if kind == "DATE":
+            out[fname] = ((_dt.date(1970, 1, 1) + _dt.timedelta(days=int(value))).isoformat(), "")
+            continue
+        if kind in ("MMSI",):
+            out[fname] = (f"{int(raw):09d}", "")
+            continue
+        if unit == "K":
+            value, unit = value - 273.15, "°C"
+        out[fname] = (round(float(value), _places(res)), unit)
+    return out
diff --git a/pyproject.toml b/pyproject.toml
index 745756b..fab5036 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ canlab-cli = "canlab.cli:main"
 include = ["canlab*"]
 
 [tool.setuptools.package-data]
-canlab = ["canlab.png", "assets/*.svg", "sample_data/*.csv", "examples/capture-kit/*"]
+canlab = ["canlab.png", "assets/*.svg", "sample_data/*.csv", "examples/capture-kit/*", "core/data/*"]
 
 [tool.ruff]
 line-length = 120
diff --git a/tests/test_n2k_db.py b/tests/test_n2k_db.py
new file mode 100644
index 0000000..c23241a
--- /dev/null
+++ b/tests/test_n2k_db.py
@@ -0,0 +1,123 @@
+"""NMEA 2000 beyond the hand-written decoders: the table distilled from canboat.
+
+The first tests are the ones that matter. The hand-written decoders were
+checked against a real marine recording; canboat is an independent source
+built from years of other people's buses. On the frames below, copied from
+that recording, the two must agree on every value they share. The rest pin
+the decoder's handling of the codes NMEA 2000 reserves.
+"""
+import json
+
+import pytest
+
+from canlab.core import n2k_db
+from canlab.core.j1939 import decode_n2k, decode_pgn, parse_j1939_id, pgn_name
+from canlab.core.multiframe import FAST_PACKET_PGNS, Reassembler
+from tests.test_multiframe import GNSS_FRAMES, GNSS_ID
+from tests.test_nmea2000 import REAL
+
+#: hand-written name -> canboat name, where they differ
+ALIAS = {"Rate of Turn": "Rate", "Course Over Ground": "COG", "Speed Over Ground": "SOG"}
+
+
+@pytest.mark.parametrize("pgn", sorted(REAL))
+def test_canboat_agrees_with_the_hand_written_decoder_on_real_frames(pgn):
+    hand, table = decode_n2k(pgn, REAL[pgn]), n2k_db.decode(pgn, REAL[pgn])
+    shared = 0
+    for name, (value, unit) in hand.items():
+        other = table.get(ALIAS.get(name, name))
+        if other is None:
+            continue
+        shared += 1
+        assert other[0] == pytest.approx(value, rel=1e-6, abs=1e-9), name
+        assert other[1] == unit, name
+    assert shared >= 1
+
+
+def test_the_gnss_fix_agrees_after_reassembly():
+    r = Reassembler()
+    msgs = []
+    for i, f in enumerate(GNSS_FRAMES):
+        msgs += r.update(GNSS_ID, f, 58.0 + 0.003 * i)
+    (m,) = msgs
+    hand, table = decode_n2k(129029, m.data), n2k_db.decode(129029, m.data)
+    for name in ("Latitude", "Longitude", "Altitude", "Time", "HDOP", "PDOP"):
+        assert table[name][0] == pytest.approx(hand[name][0], rel=1e-9), name
+    assert table["Date"][0] == hand["Date"][0] == "2021-03-25"
+    assert table["Number of SVs"][0] == hand["Satellites Used"][0]
+
+
+def test_a_pgn_without_a_hand_written_decoder_decodes_from_the_table():
+    out = decode_pgn(127488, bytes([0x00, 0x40, 0x1F, 0xFF, 0xFF, 0x7F, 0xFF, 0xFF]))
+    assert out["Speed"] == (2000.0, "rpm")
+    assert "Boost Pressure" not in out                 # 0xFFFF: not available
+    assert "Tilt/Trim" not in out                      # 0x7F: signed not available
+    assert pgn_name(127488) == "Engine Parameters, Rapid Update"
+
+
+def test_error_and_reserved_codes_are_not_readings():
+    out = n2k_db.decode(127488, bytes([0xFD, 0xFE, 0xFF, 0xFD, 0xFF, 0x7E, 0xFF, 0xFF]))
+    assert out["Speed"] == ("error", "")               # 0xFFFE
+    assert "Boost Pressure" not in out                 # 0xFFFD: above the valid range
+    assert out["Tilt/Trim"] == ("error", "")           # 0x7E: signed error
+    assert "Instance" not in out                       # 253: reserved
+
+
+def test_a_fast_packet_is_decoded_only_once_reassembled():
+    payload = bytearray(26)
+    payload[0] = 0                                     # instance
+    payload[1:3] = (3000).to_bytes(2, "little")        # oil pressure, 100 Pa/bit
+    payload[3:5] = (3631).to_bytes(2, "little")        # 363.1 K, 0.1 K/bit
+    payload[5:7] = b"\xff\xff"                         # temperature: unsigned n/a
+    payload[7:9] = (1410).to_bytes(2, "little")        # alternator, 0.01 V
+    payload[9:26] = b"\xff" * 17
+    payload[9:11] = b"\xff\x7f"                        # fuel rate: signed n/a is 0x7FFF
+    assert 127489 in FAST_PACKET_PGNS
+    assert decode_pgn(127489, bytes(payload[:8]), reassembled=False) == {}
+    out = decode_pgn(127489, bytes(payload), reassembled=True)
+    assert out["Oil pressure"] == (300000.0, "Pa")
+    assert out["Oil temperature"][0] == pytest.approx(89.95, abs=1e-9)
+    assert out["Oil temperature"][1] == "°C"          # kelvin converted
+    assert out["Alternator Potential"] == (14.1, "V")
+    assert "Fuel Rate" not in out and "Temperature" not in out
+    minus_one = bytearray(payload)
+    minus_one[9:11] = b"\xff\xff"                      # signed 0xFFFF is -1, a reading
+    assert decode_pgn(127489, bytes(minus_one), reassembled=True)["Fuel Rate"] == (-0.1, "L/h")
+
+
+def test_the_reassembler_handles_a_fast_packet_the_hand_table_does_not_know():
+    """127489 was not in the hand-written table, so its frames were left alone."""
+    payload = bytes([0, 0xB8, 0x0B, 0x2F, 0x0E] + [0xFF] * 21)          # 26 bytes
+    frames = [bytes([0x20, len(payload)]) + payload[:6]]
+    rest, counter = payload[6:], 1
+    while rest:
+        frames.append(bytes([0x20 | counter]) + rest[:7].ljust(7, b"\xff"))
+        rest, counter = rest[7:], counter + 1
+    r = Reassembler()
+    arb = 0x09F20123                                   # PGN 127489 from 0x23
+    msgs = []
+    for i, f in enumerate(frames):
+        msgs += r.update(arb, f, 1.0 + 0.001 * i)
+    (m,) = msgs
+    assert m.pgn == 127489 and m.data == payload
+    assert decode_pgn(m.pgn, m.data, reassembled=True)["Oil pressure"] == (300000.0, "Pa")
+
+
+def test_a_repeating_group_is_not_decoded_as_one_value():
+    """129540 lists one entry per satellite. The table stops before the
+    group, so no single satellite's PRN is presented as the PRN."""
+    fields = [f[0] for f in n2k_db.definition(129540)["fields"]]
+    assert "Sats in View" in fields and "PRN" not in fields and "SNR" not in fields
+
+
+def test_proprietary_pgns_are_named_not_guessed():
+    assert n2k_db.definition(130821) is None
+    assert pgn_name(130821) == "Proprietary fast packet (manufacturer defined)"
+    assert parse_j1939_id(0x18FF0523)["protocol"] == "J1939"         # PropB, data page 0
+
+
+def test_the_table_ships_with_its_licence():
+    data = json.loads(n2k_db.DATA.read_text())
+    assert len(data["pgns"]) >= 200 and data["source"].startswith("canboat")
+    notice = (n2k_db.DATA.parent / "CANBOAT-NOTICE.txt").read_text()
+    assert "Apache License, Version 2.0" in notice and "Kees Verruijt" in notice
diff --git a/tools/build_n2k_table.py b/tools/build_n2k_table.py
new file mode 100644
index 0000000..d78c88c
--- /dev/null
+++ b/tools/build_n2k_table.py
@@ -0,0 +1,128 @@
+"""Distil canboat's NMEA 2000 definitions into the table CanLab decodes with.
+
+canboat (github.com/canboat/canboat, Apache License 2.0, Kees Verruijt)
+publishes a machine-readable definition of nearly every NMEA 2000 PGN, built
+from years of reverse engineering real buses. This keeps the part CanLab
+needs: each standard PGN's name, whether it is a single frame or a fast
+packet, and its fixed-position fields with resolution, sign, unit, valid
+range and lookup table.
+
+    python tools/build_n2k_table.py [--source canboat.json] [--tag vX.Y.Z]
+
+Writes canlab/core/data/n2k_pgns.json and the licence notice beside it.
+Proprietary PGNs are left out: canboat defines several per PGN, one per
+manufacturer, and choosing among them needs the manufacturer code, which a
+table this simple cannot do honestly. So are fields after the first
+variable-length one, because their positions depend on the data.
+"""
+from __future__ import annotations
+
+import argparse
+import json
+import urllib.request
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+OUT = REPO / "canlab" / "core" / "data" / "n2k_pgns.json"
+NOTICE = REPO / "canlab" / "core" / "data" / "CANBOAT-NOTICE.txt"
+URL = "https://raw.githubusercontent.com/canboat/canboat/{tag}/docs/canboat.json"
+
+DECODED = {"NUMBER", "LOOKUP", "DURATION", "TIME", "DATE", "MMSI", "PGN",
+           "ADDRESS", "STRING_FIX", "INDIRECT_LOOKUP"}
+
+
+def proprietary(pgn: int) -> bool:
+    return (pgn == 0xEF00 or 0xFF00 <= pgn <= 0xFFFF or pgn == 126720
+            or 130816 <= pgn <= 131071 or 0x1EF00 <= pgn <= 0x1EFFF)
+
+
+def build(src: dict) -> dict:
+    by_pgn: dict[int, list] = {}
+    for p in src["PGNs"]:
+        by_pgn.setdefault(p["PGN"], []).append(p)
+    used_lookups: set[str] = set()
+    table = {}
+    skipped = {"proprietary": 0, "ambiguous": 0}
+    for pgn, defs in sorted(by_pgn.items()):
+        if proprietary(pgn):
+            skipped["proprietary"] += 1
+            continue
+        if len(defs) > 1:
+            skipped["ambiguous"] += 1
+            continue
+        p = defs[0]
+        if p.get("Type") not in ("Single", "Fast"):
+            continue
+        fields = []
+        # A repeating group (satellites, AIS slots, ...) has a count field and
+        # then N copies of a set of fields. Decoding the first copy as if it
+        # were the only one would present one satellite's PRN as "the" PRN,
+        # so the table stops where the group starts.
+        repeat_at = min((p[k] for k in ("RepeatingFieldSet1StartField",
+                                          "RepeatingFieldSet2StartField") if p.get(k)),
+                        default=None)
+        for f in p.get("Fields", []):
+            if repeat_at is not None and f.get("Order", 0) >= repeat_at:
+                break
+            if f.get("BitOffset") is None:
+                break                        # variable length: positions unknown
+            kind = f.get("FieldType")
+            if kind not in DECODED:
+                continue
+            lookup = f.get("LookupEnumeration")
+            if lookup:
+                used_lookups.add(lookup)
+            fields.append([
+                f["Name"], f["BitOffset"], f["BitLength"], f.get("Resolution") or 1,
+                bool(f.get("Signed")), f.get("Unit") or "", kind,
+                f.get("RangeMin"), f.get("RangeMax"), f.get("Offset") or 0, lookup or "",
+            ])
+        table[str(pgn)] = {"name": p["Description"], "fast": p["Type"] == "Fast",
+                           "fields": fields}
+    lookups = {}
+    for e in src.get("LookupEnumerations", []):
+        if e["Name"] in used_lookups:
+            lookups[e["Name"]] = {str(v["Value"]): v["Name"] for v in e["EnumValues"]}
+    return {"source": f"canboat {src.get('Version', '')}",
+            "licence": "Apache-2.0, see CANBOAT-NOTICE.txt",
+            "pgns": table, "lookups": lookups, "skipped": skipped}
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser(description=__doc__)
+    ap.add_argument("--source", help="a local canboat.json instead of downloading")
+    ap.add_argument("--tag", default="master", help="canboat git ref to download")
+    args = ap.parse_args()
+    if args.source:
+        src = json.loads(Path(args.source).read_text())
+    else:
+        with urllib.request.urlopen(URL.format(tag=args.tag), timeout=120) as r:
+            src = json.loads(r.read())
+    table = build(src)
+    OUT.parent.mkdir(parents=True, exist_ok=True)
+    OUT.write_text(json.dumps(table, separators=(",", ":"), ensure_ascii=False))
+    NOTICE.write_text(
+        "canlab/core/data/n2k_pgns.json is derived from docs/canboat.json in\n"
+        "CANboat, https://github.com/canboat/canboat\n\n"
+        f"{src.get('Copyright', '(C) 2009-2026, Kees Verruijt, Harlingen, The Netherlands.')}\n\n"
+        "Licensed under the Apache License, Version 2.0 (the \"License\");\n"
+        "you may not use this file except in compliance with the License.\n"
+        "You may obtain a copy of the License at\n\n"
+        "    http://www.apache.org/licenses/LICENSE-2.0\n\n"
+        "Unless required by applicable law or agreed to in writing, software\n"
+        "distributed under the License is distributed on an \"AS IS\" BASIS,\n"
+        "WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n"
+        "See the License for the specific language governing permissions and\n"
+        "limitations under the License.\n\n"
+        "Changes: kept each standard PGN's name, frame type and fixed-position\n"
+        "fields, and the lookup tables those fields use; dropped proprietary\n"
+        "PGNs and fields whose position depends on earlier variable-length data.\n")
+    n_fields = sum(len(p["fields"]) for p in table["pgns"].values())
+    print(f"{len(table['pgns'])} PGNs, {n_fields} fields, {len(table['lookups'])} lookups "
+          f"from {table['source']}; skipped {table['skipped']}")
+    print(f"wrote {OUT} ({OUT.stat().st_size / 1e3:.0f} kB)")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())