DESCRIPTION
The compass feature is designed to be integrated into an electro chromic interior rearview mirror.
The mirror assembly shall display a compass heading. The compass mirror then take the sensor information to determine static field strengths and rotating field information to determine an accurate compass heading.
SPECIFICATIONS
Scheme 12
SWITCH POINT ACCURACY
The compass module shall, while compensating for the vehicle magnetic fields, until the Earth's varying magnetic fields to determine direction.
[SWITCH POINTS]
Scheme 13
Note. There should be hysteresis at each switch point. Switch points between the 8 cardinal directions, these switch points are +/- 10°.
Scheme 14
COMPASS DISPLAY INTERVALS
Compass display should be updated at every two seconds.