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.
Item | Standard value |
Rate voltage | DC 12V |
Operating voltage range | DC9 ~ 16V |
Operating temperature range | -30 ~ +65°C |
Direction display | 8 |
Renewal time | 2 sec. |
The compass module shall, while compensating for the vehicle magnetic fields, until the Earth's varying magnetic fields to determine direction.
Switch point | Heading ± 10° |
N - NE | 22.5 |
NE - E | 67.5 |
E - SE | 112.5 |
SE - S | 157.5 |
S - SW | 202.5 |
SW - W | 247.5 |
W - NW | 292.5 |
NW - N | 337.5 |
There should be hysteresis at each switch point.
Switch points between the 8 cardinal directions, these switch points are ± 10°
Compass display should be updated at every two seconds.
The compass can be turned ON and OFF and will remember the last state when the ignition is cycled. To turn the display feature ON/OFF :
Press and release the feature control button (A) to turn the display feature OFF.
Press and release the feature control button (A) again to turn the display back ON.
Additional options can be set with press and hold sequences of the feature control button (A) and are detailed below.
There is a difference between magnetic north and true north. The compass in the mirror can compensate for this difference when it knows the magnetic zone in which it is operating. This is set either by the dealer or by the user.
