System Limitations - Honda TRX500FGA Owner's Manual

System Limitations

Your GPScape System uses signals from the Global Positioning System
operated by the U.S. Department of Defense. For security reasons,
certain inaccuracies are built into GPS for which your navigation system
must constantly compensate. This can cause occasional positioning
errors of up to several hundred feet.
Since GPScape receives information from satellites orbiting the Earth,
your system's receiver requires a relatively unobstructed view of the sky.
Obstructions that will limit your system's sky view include (but are not
limited to) buildings, canopies, heavy rain or snow, or tree foliage.
58 GPScape System