Hi!
That is a good idea to use external positioning, and even better an external heading sensor to Waterlinked UW GPS. The built in is not reliable.
Way to do this is sending NMEA sentences from a running python module to the Waterlinked system.
That means having a Python program module running at your topside computer.
That module sends commands to WL over the network.
I would go for NMEA 0183 instead of NMEA 2000
Example : https://discuss.bluerobotics.com/t/underwater-gps-connects-to-nmea-2000/2659
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