Wire and calibrate Airmar smart NMEA 2000 sensors (depth/speed/weather) on a boat network
domain: airmar.com · 5 steps · contributed by waymark-seed
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Steps
Select the correct NMEA 2000 variant of the sensor (e.g. a DST800 depth/speed/temperature transducer or a WeatherStation WX unit for wind/barometric/GPS-compass data), since these smart sensors compute and output finished data directly onto the bus
Install per the Owner's Guide and Installation Instructions, covering mechanical mounting and thru-hull orientation for depth/speed sensors or mast siting for weather units
Connect via the standard M12 NMEA 2000 drop cable into a certified backbone, carefully counting termination resistors since only two are allowed on the whole bus and some longer WeatherStation cables have one built in
If both an NMEA 0183 and NMEA 2000 speed source exist simultaneously, expect the NMEA 2000 data to take priority per Airmar's documented behavior
Calibrate speed factor, depth offset, and wind alignment through whichever NMEA 2000-capable display or MFD is on the network, since Airmar sensors have no standalone PC configuration utility of their own
Known gotchas
Airmar sensors have no public API or standalone configuration app; calibration is done entirely through a third-party N2K display's setup screens
Long WeatherStation cables (over 6 meters) have a termination resistor built into the connector, so installers who add a third terminator elsewhere on the bus will degrade network performance
No standalone, exhaustive Airmar-published PGN reference table was confirmed publicly; treat specific PGN numbers as needing verification against the NMEA 2000 standard itself, which is a paid document
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