@rmackay9
The output of more information via NMEA would greatly help for navigation. You can use real nautical charts, I wrote about this earlier. It would also be great if we added support for the NMEA compass.
@Vassili_Siskos Use OpenCPN and PyPilotI! have been using it for a long time for bathymetry with Furuno equipment(Compas, GPS, Echosouder, AIS, Satellite compas). Full support for Signal K, NMEA 2000, NMEA 0183. Reefmaster for creating maps is the same toy as Ardupilot, they are good for hobbies and playing around. For maps, it is better to use something like Hypack.I’ve been using it for several years