Discovery 2. Manual — part 359

NAVIGATION SYSTEM

DESCRIPTION AND OPERATION

87-11

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DESCRIPTION AND OPERATION

NAVIGATION SYSTEM

87-12

DESCRIPTION AND OPERATION

CARiN III Navigation and Trafficmaster
System Component Location

NAVIGATION SYSTEM

DESCRIPTION AND OPERATION

87-13

1 GPS antenna
2 Display unit
3 Switch pack
4 Trafficmaster antenna
5 Navigation speaker
6 Trafficmaster monitor unit
7 Navigation computer

NAVIGATION SYSTEM

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DESCRIPTION AND OPERATION

Description

General
Where fitted, the CARiN III and Trafficmaster system combines a satellite navigation system (CARiN III) with a real-
time traffic information system (Trafficmaster).

The satellite navigation system provides computer generated audible and visual route guidance information to enable
the driver to reach a desired destination. The system allows the driver to choose between road navigation and off-
road navigation, and to incorporate waypoints. Road navigation also allows the driver to choose between using minor
or major roads and the quickest or shortest route. Directions to hospitals, museums, monuments, hotels etc. are also
available. The computer uses map information stored on a CD-ROM to determine the best route for the journey and
provide the driver with details of directions and approaching junctions. The current position of the vehicle is
determined using a combination of vehicle sensor inputs and the Global Positioning System (GPS).

The Trafficmaster system displays live traffic flow information on the road navigation map screens. Traffic speed is
indicated on the maps by colour coded roads and arrows. The traffic flow information is relayed from a network of
sensors covering motorways and trunk roads. Data from the sensors is updated on a three minute cycle, 24 hours a
day, 365 days a year.

The navigation system consists of the following components:

l

Navigation computer

l

GPS antenna

l

Display unit

l

Switch pack

l

Navigation speaker

l

Trafficmaster monitor ECU

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Trafficmaster antenna

Navigation Computer
The navigation computer is located in a bracket under the RH front seat, immediately behind the CD autochanger.
The navigation computer contains all the hardware and software required for control of the navigation system,
including the GPS receiver and a solid state piezo gyro. Using the gyro, and inputs from the GPS antenna and the
vehicle K bus, the navigation computer determines the vehicle’s current position, direction and speed.

The navigation computer also houses a CD-ROM drive. The drive is used to read map data from country specific CD’s
and also to load software into the computer. A button, adjacent to the CD slot, is provided to eject the CD from the
unit. If the ignition is on, one press of the button will eject the CD. If the ignition is off, two presses are required, one
to wake up the system and the second to eject the CD. Access to the CD-ROM drive is from the rear of the RH front
seat.