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A U D I O E Q U I P M E N T a n d T E L E M A T I C S
NAVIGATION-GUIDANCE
GPS
What is the navigation system and
the GPS?
The satellite navigation system guides
the driver to the destination that he has
set in accordance with a chosen route.
Initially, it searches for the destination
required by the user, then it calculates
and audible guidance instructions.
The GPS (Global Positioning
System) consists of several
satellites distributed around
the earth. They continuously
transmit
which travel at the speed of light, on 2
different frequencies.
At any given time, the system receives
its position in relation to the satellites
detected and the time of transmission
of the signal.
This enables the telematic unit to
deduce its position and therefore that of
the vehicle.
A
repositioning
process
map database stored on the hard disc
permits repositioning of the vehicle's
position on the road network in order
XI
to improve the accuracy of the locating
function.
172
What precautions should be
observed in order to use the system
under good conditions?
Do not place anything on or near the
GPS aerial.
Do not use any digital communication
equipment (personal computers, etc.)
near the GPS aerial.
containing carbon to the window.
The system's measurements may be
inaccurate if the vehicle is:
-
in a tunnel or underground car
park,
-
underneath a two-level motorway,
-
in an area with several very high
buildings,
digital
signals
-
surrounded
trees.
Depending on the vehicle's situation and
the reception of the GPS information, the
displayed information may disappear
from the display temporarily.
using
the
What is a point of interest (POI)?
for each group:
-
-
by
closely
planted
-
-
A point of interest (POI) is
represented by an icon on
the map, it represents an
airport, a station, a town
hall, etc.
Up to 40 different icons may
be displayed (refer to the
section "Points of interest
icon").
(Green),
Vehicles and travel (Dark blue),
Restaurants (Orange),
Public
places
and
emergency
services (Brown),
Entertainment
and
attractions
(Blue).
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