The Simrad FC40 fluxgate compass is designed for connection to the SimNet network. It is equipped with 5,5 m (18 feet) of SimNet cable with connector. The compass transmit the heading even if the autopilot is switched off. 

Input from SimNet:

- Heading offset

- Calibration start

- Software upload 

Output on SimNet/NMEA2000 format

The compass is NMEA2000 compatible and outputs PGN 127250. 

- Calibrated heading, transmission rate of 20 Hz when selected as heading source on SimNet,
otherwise 1 Hz.

- Magnetic field data

- Error messages and status information