PNI is a company that can offer very small geomagnetic sensors with high sensitivity.
The applications using the products would be to control the attitude of devices like flying objects such as UAV and drones, as well as ocean buoys and AHRSs.

[Key words]
Geomagnetic sensors, UAVs, Unmanned Aerial Vehicles, Drones, Controlling aerial attitude, AHRS, Digital compasses