Made compass on atomS3R

[mgrouch]

I’ve designed a new NMEA compass on atomS3R. Tilt compensated. Transmitting magnetic heading, roll, pitch, rate of turn. Works with OpenCPN. Calibration procedure is simple and doesn’t require additional tools. Device firmware provides calibration procedure and instructions. Open source code.

The project and the code with instructions

https://github.com/bareboat-necessities/bbn_compass