Autonnic is a British based company that manufactures specialist marine electronics.
The Autonnic product range include highly accurate heading sensors for use with autopilots, chart plotters, AIS or anywhere an accurate heading or compass reading is required. A gyro based version is available and best suited to sailing vessels or where you want a highly accurate heading that is compensated by the vessels heel or pitch at up to 45 degrees.
They also have a range of wind instruments, with models for sail or powered vessels. Both their heading and wind instruments come in versions with NMEA0183 and NMEA2000 outputs.
Manufacturer’s website: https://www.autonnic.com