The Autonnic Compass Sensor uses fluxgate technology to provide the most accurate magnetic heading.  Also, there is aGyro version. The unit is weather tight, allowing an optimal installation position inside or outside the hull.
 
Provides magnetic heading data
Vessel movement compensation
NMEA 2000
Water resistant to IP68
Auto calibration
Compatible with 3rd party displays and devices
Supplied with 1 Metre of cable in the box
A5050 without Gyro
A5060 with Gyro
 
To find our more please visit our compass sensors page. https://www.autonnic.com/marine-compass-sensors