Pioneer Radio AppRadio User Manual

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Appendix
Appendix
77
En
Appendix
Positioning technology
Positioning by GPS
The Global Positioning System (GPS) uses a
network of satellites orbiting the Earth. Each
of the satellites, which orbit at a height of
68 900 000 feet (21 000 km), continually broad-
casts radio signals giving time and position in-
formation. This ensures that signals from at
least three can be picked up from any open ar-
ea on the ground’s surface.
The accuracy of the GPS information depends
on how good the reception is. When the sig-
nals are strong and reception is good, GPS
can determine latitude, longitude and altitude
for accurate positioning in three dimensions.
But if signal quality is poor, only two dimen-
sions, latitude and longitude, can be obtained
and positioning errors are somewhat greater.
Handling large errors
Positioning errors are kept to a minimum by
combining GPS, dead reckoning and map
matching. However, in some situations, these
functions may not work properly, and the error
may become larger.
When positioning by GPS is
impossible
• GPS positioning is disabled if signals can-
not be received from more than two GPS
satellites.
• In some driving conditions, signals from
GPS satellites may not reach your vehicle.
In this case, it is impossible for the system
to use GPS positioning.
In tunnels or en-
closed parking
garages
Under elevated
roads or similar
structures
When driving
among high
buildings
When driving
through a dense
forest or tall trees
• If a car phone or cellular phone is used
near the GPS antenna, GPS reception may
be lost temporarily.
• Do not cover the GPS antenna with spray
paint or car wax, because this may block
the reception of GPS signals. Snow buildup
can also degrade the signals, so keep the
antenna clear.
❐ If a GPS signal has not been received for a
long time, your vehicle’s actual position
and the current position mark on the map
may diverge considerably or may not be up-
dated. In such a case, once GPS reception
is restored, accuracy will recover.
Conditions likely to cause notice-
able positioning errors
For various reasons, such as the state of the
road you are traveling on and the reception
status of the GPS signal, the actual position of
your vehicle may differ from the position dis-
played on the map screen.

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