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Introduction and controls 1-3
JJM 18 05 16/00 Last amend: November 1999 – NAS
Using the system (continued)
Reception of GPS signals
GPS signals are highly directional and
reception may occasionally be
interrupted. Some examples of situations
likely to cause problems are shown
below.
• Inside tunnels.
• Inside buildings.
• Roads under raised highways.
• Densely tree-lined roads.
• Forest roads between mountains.
• Between tall buildings.
• Roads under cliffs.
• Metal objects placed on the rear
parcel shelf.
• Fitting material to the rear screen
containing metal foil.
Errors in vehicle position
Under certain driving conditions, it is
possible that the vehicle position shown
may be incorrect. Some examples are
shown below.
• When the vehicle is transported by
ferry or train.
• Driving on steep roads.
• After vehicle battery removal or
supply fuse failure.
• When using snow chains.
• After the tyres have been replaced.
• After the vehicle has been rotated on
a turntable.
• Where there are two roads parallel to
each other.
• Elevated roads in proximity to other
roads.
• Driving up or down circular ramps in
car parks.
The position will usually be corrected
automatically. If not it can be corrected
manually, see
Calibration settings
on
page 3-7.
Route guidance precision
Under certain driving conditions, it is
possible that the route guidance may be
inaccurate. Some examples are shown
below.
• Deviation from a route may cause
incorrect guidance until the route has
been recalculated.
• Route guidance may be given where
no turn is required.
• If there is no road, or only a narrow
track, to the final destination,
guidance will be given to the nearest
point possible.
• No guidance is given while reversing.
• If driving at high speed or on very
dense road networks, it may not be
possible to recalculate the route in
time for the next instruction.
• On familiar roads, personal route
preferences may not always be
followed.