The Base Station GPS Antenna receives position measurements from the GPS satellites. The Base Station then calculates
position data and transmits the data to the vehicle via a 900 MHz radio modem link. This radio modem link requires a
line-of-sight between the vehicle and the Base Station. The higher the elevation of the Radio Modem Antenna, the easier it is
for a vehicle to receive a clear signal. Ideally, the Base Station should be set up in an open field with an unobstructed view of
the sky.

Note: Do not locate the Base Station adjacent to large metal structures, which can redirect the GPS signals and cause
interference.

Figure 2-1

Improper Base Station Positioning