Single Frame: Yes Priority: 2/Y/Y Update Rate: 100 mS/Y/Y Destination: Global Query Support: Yes Access Level: 0
For further information about the NMEA 2000® protocol, including field descriptions refer to the document, NMEA 2000® Standard for Serial-Data
Networking of Marine Electronic Devices available from NMEA.
Notes
The value in field 2 provides ship heading relative to magnetic north. This value includes corrections for deviation and attitude offsets. Use PGN 126720-33 to calibrate the
compass (produce a deviation table). Use PGN 126720-32 to establish sensor attitude offsets.
To obtain ship heading relative to true north, add the variation value in field 4 to the heading sensor reading in field 2.
See also Magnetic Variation PGN 127258.
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