Bearing (also known as course) is the device's horizontal direction of travel. Starts at 0 in the geographical north and rotates around the compass in a clockwise direction. This means for going north it is equal to 0, for northeast it is 45, for east it is 90 and so on. Note that this may be different from the orientation of the device. If it cannot be determined, the value is null. Otherwise, it is guaranteed to be in the range [0, 360).