Compassheading or compass course, before correction for magnetic deviation or magnetic variation.
罗盘航向或罗盘航线。未修正磁偏转或磁变。
2
User orientation sensor: directional heading from a digital compass.
方向感知：基于数码罗盘的方向指南。
3
Information such as speed, heading, GPS difference equipment can also be the vehicle of various sensors (such as log, speed meter, magnetic compass, etc.) for the calibration work.