CITROEN C4 Aircross 2013 Owner's Handbook Manual page 272

04
NAVIGATION - GUIDANCE
GPS system
What is the navigation system and GPS?
The satellite navigation system guides the driver to the destination
set in accordance with a chosen route.
Initially, it searches for the destination required by the user, then
it calculates the route and fi nally it provides the visual and vocal
guidance instructions.
GPS (Global Positioning System) consists of several
satellites arranged around the earth. They continuously
transmit digital signals 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 calculate its position
and therefore that of the vehicle.
A repositioning process using the map database stored
on the hard disk allows the vehicle to be positioned
on the road network, so improving the accuracy of
the vehicle location function.
What precautions should be observed in order to make
best use of the system?
Do not place anything on or near the GPS aerial.
Do not use any digital communication equipment (personal
computers, etc.) near the GPS aerial.
Do not affi x any refl ective fi lms or fi lms containing carbon to the
windows.
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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,
- surrounded by closely planted trees.
Depending on the vehicle's situation and the reception of the GPS
information, the displayed information may disappear from the
screen temporarily.
What is a point of interest (POI)?
A point of interest (POI) is represented by an icon on
the map, it represents an airport, a station, a town
hall, ...
Up to 40 different icons may be displayed (refer to the
section "Points of interest icon").
They are classifi ed in 5 groups and identifi ed by one
colour for each group:
- Shops, fi nance and businesses (Green),
- Vehicles and travel (Dark blue),
- Restaurants (Orange),
- Public places and emergency services (Brown),
- Entertainment and attractions (Blue).