Alpine NVE-N872A Manual De Hardware página 7

Gyroscope
The gyroscope is a sensor that accurately
measures the angle by which the direction of
a vehicle or other moving body changes.
Gyroscopes are used in inertial navigation
systems for airliners and ships. In this
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.
In tunnels and indoor
parking lots
On the bottom level of
double-decker motorways
navigation system, the gyroscope is used
together with the speed sensor, making it
possible to display the position of the vehicle
even in locations where GPS signals may be
blocked.
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.
Locations surrounded
by tall buildings
When a GPS satellite is low on the horizon (angle
below 10°), obstructions sometimes make normal
reception impossible
Locations surrounded
by tall trees
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