9
Locations where GPS signals are received easily
Locations where GPS signals cannot be received
In the following locations or conditions GPS signals cannot be received. However even in
these locations, the gyroscope and speed sensor will provide a substitute means of
determining the vehicle's position and the system will be able to continue to track the
vehicle's progress along the route.
The optimum locations for receiving GPS
signals are locations that command a
good view where there are no tall
buildings, trees, or other objects to
obstruct the signals.
In tunnels and indoor
parking lots
Locations surrounded
by tall buildings
Locations surrounded
by tall trees
On the bottom level of
double-decker motorways
When a GPS satellite is low on the horizon (angle
below 10°), obstructions sometimes make normal
reception impossible
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