change time LAND ROVER DISCOVERY 1999 Owner's Guide

NAVIGATION SYSTEM
87-14 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:
lNavigation computer
lGPS antenna
lDisplay unit
lSwitch pack
lNavigation speaker
lTrafficmaster monitor ECU
lTrafficmaster 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.

INSTRUMENTS
DESCRIPTION AND OPERATION 88-43
Compass
The mirror's compass display is activated when the ignition switch is turned to position 'II'. If the compass has been
previously calibrated, the current direction of the vehicle will be shown in the LED display at the upper RH side of the
mirror's reflective surface. The display is able to indicate one of eight compass points (i.e. N, NE, E, SE, S, SW, W or
NW).
The compass mirror circuit board contains a microchip which is able to determine changes in vehicle direction due to
the changes in the earth's magnetic field. The circuit board is located in the stem of the mirror so that it follows the
changes in the vehicles direction and is not affected by adjustment of the mirror itself.
Because of changes in the lines of magnetic influence, the compass is set for operation in one of fifteen different zones
depending on the current location of the vehicle. If the vehicle is to be driven in a different zone, the compass will have
to be reset for operation in that zone. To determine the correct zone for a particular location on the planet, refer
to the maps provided in the Owner's Handbook. The mirror's default setting is zone 8 which is suitable for central
European countries (Germany, Austria, Italy etc.).
The compass should be set to the correct zone using the following procedure:
1Switch the ignition to position 'II'.
aIf the compass displays one of the eight compass point directions, proceed to step '3'.
bIf the compass displays 'C' then proceed to step '2'.
cIf the display does not show either of the above, then the calibration button on the underside of the mirror
should be pressed and held for approximately 6 seconds, using a small probe (e.g. paper clip or ballpoint
pen). The compass should now enter the set mode and 'C' should be shown in the display.
2To calibrate the compass, the vehicle must be driven slowly (5 mph (8 km/h) or less) in a circle until the display
shows a direction (usually 1 or 2 revolutions). The mirror can calibrate itself during normal driving, but this will
take considerably longer.
3Set the compass to the relevant zone of magnetic influence by pressing the calibration button on the underside
of the mirror for approximately 3 seconds, using a small probe, until a number is shown in the display. If the zone
is being entered for the first time, the default zone setting '8' should be displayed. If the zone is being reset from
a previous entry, the previous zone setting number will be displayed.
The calibration button should now be pressed and released with single presses, using a small probe, until the
desired zone number appears in the display.
After approximately 10 seconds, the compass display should return correctly set to the required zone.
Note the degree of magnetic variation from one zone to another is only very slight. Recalibration of the compass is
not normally necessary unless several zone changes are undertaken.
Automatic dimming
The mirror's automatic dimming function operates when the ignition switch is turned to the 'II' position.
A light sensor is contained at the upper centre of the mirror which detects the intensity of light from the headlights of
following vehicles in dark or low light conditions. When the light intensity is sufficiently high, the mirror automatically
adjusts the brightness of the reflected light by photochromatically changing the mirror's reflective properties and so
preventing glare affecting the driver.
When reverse gear is selected, the power supply for the mirror's photochromatic function is opened so that the mirror
defaults to its normal reflective properties while the reversing operation is in progress.
Another light sensor is located on the rear of the mirror so that the unit can detect the difference between strong
ambient light and that attributable to following vehicle headlights. To check operation of the light dimming function of
the mirror, use the following procedure:
1Turn ignition switch to position 'II', and ensure reverse gear is not selected.
2Cover the sensor on the back of the mirror.
3Shine a bright light on the front (reflective side) of the mirror; the mirror should darken.