1. The magnetic compass system errors and the shortage of all attitude magnetic heading error compensation algorithms mentioned in many articles are analyzed.

2. Magnetic heading measure system(MHMS) or electric magnetic compass is an essential device used to measure the heading of ships, land vehicles and unmanned aerial vehicles(UAV).

3. 30 Magnetic heading measure system(MHMS) or electric magnetic compass is an essential device used to measure the heading of ships, land vehicles and unmanned aerial vehicles(UAV).