Verify the following:
- For most vehicles, the front, center part of the cab is the best.
- Place the antenna with an unobstructed view of the sky. An obstructed view of the sky may impair system performance. The GPS engine computes a position based on measurements from each satellite to the internal GPS receiver.
- Mount the antenna on, or as close as possible to, the center of your point of measurement. For example, ideal antenna placement on a vehicle is the center of the cab roof, assuming there is a clear view of the sky.
- Position the antenna as high as possible.