Range Rover P38
NAVIGATION SYSTEM
17
DESCRIPTION AND OPERATION
GPS Version Information
Selecting the GPS item from the service mode menu
causes the GPS Version info to be displayed.
Selecting ’<Return’ returns the system to the service
mode menu. Selecting ’Functions’ shows the pop up
menu.
The status of the GPS system can be checked as
follows:
From the Service mode menu select GPS. Selecting
’Function’ brings up a menu. On selecting ’GPS
Status’ the system displays the status screen.
When the GPS system is exposed to satellites for the
first time it can take up to 15 minutes to determine the
position of the vehicle.
The Receiver status (’Rec Stat’) and Position source
(’Pos Src’) may be used to check that the GPS system
is functioning correctly. Receiver status displays one
of the following:
COMERR
There is a communication error between the GPS
receiver and the navigation computer.
SEARCH
The system is tracking a number of satellites. If this is
displayed it may simply be that there is a failure in the
GPS system. First check that the GPS antenna’s view
of the sky is not blocked in any way. Check harness
connections between the GPS Receiver and the GPS
antenna.
TRACK
The system is tracking a number of satellites. The
number displayed in the Pos Src indicates how many
satellites the GPS system can see. This indicates that
the system is all connected correctly but does not
have enough information to determine the position of
the vehicle. Check that there is nothing obstructing the
GPS antenna’s view of the sky - e.g. a metallic object
on the right hand side plenum area. It may take
several minutes for the GPS system to aquire enough
satellites to determine the vehicle position (POS).
POS
The system has a current position fix. This indicates
that the GPS system is functioning normally. The Pos
Src indicates the type of position fix (2D or 3D) and
the number of satellites that are available.
The screen shows the current position in Latitude and
Longitude, the approximate height of the vehicle and
the GPS time and date. The GPS time and date is
always displayed in Greenwich meantime (GMT).
The ground speed and heading can be checked when
the vehicle is in motion - The indicated ground speed
should be the actual vehicle speed in m/s and the
heading should be the actual direction of the vehicle.
GPS Tracking Information
Selecting the ’GPS Tracking Information’ from the
GPS functions menu displays the satellite being
tracked on each channel together with a signal level.
The screen also displays the number of satellites that
are currently visible and the Almanac status.
