Subaru 2012 Tribeca Navigation System - Manual (Page 121)

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General Information
■ Accuracy of vehicle position
Area in which GPS signals cannot be received
Because the radiowave signals from the GPS satellites travel
primarily by line of sight, the navigation system might not be
able to receive the signals in the areas described below.
(If the GPS mark does not appear on the map screen, it
means that the GPS radiowave signals are not being
properly received.)
(1) Inside a tunnel
(2) Inside a building
(3) Under a three-dimensional road system such as for high-
speed roads
(4) On boulevards lined with trees
(5) Between buildings
(6) Under a cliff or in a cave
• If the GPS antenna or its surroundings are blocked by an
obstacle (including cargo), it might not be possible for the
system to receive the GPS radiowave signals.
• If multiple paths are created due to the reflection from
buildings, a large measurement error could occur, causing
the vehicle’s mark to deviate from its actual position.
Deviation of the vehicle’s position mark
The vehicle’s position mark could deviate from its actual
position when the vehicle is being driven under the
conditions listed below or due to conditions of the GPS
satellites.
If the vehicle travels on a road whose actual shape differs
from that in the map data, the vehicle’s mark could deviate
from the actual position. The correct position will eventually
appear on the screen through the correction function. If the
screen does not show the correct position for an excessively
long time, correct the current position or make an automatic
correction.
(1) The vehicle’s mark could appear on a parallel road.
(2) When the road splits into a narrow Y, the vehicle’s mark
could appear on the other fork of the Y.
(3) When the vehicle makes a right or left turn, the vehicle’s
mark could appear on one street ahead or behind.
(4) If the vehicle is transported by means other than the
vehicle’s own power, such as on a ferryboat, the
vehicle’s mark will remain in the position it was before
the transport until the system can calculate the position
through the GPS.
(5) When the vehicle is driven on a steep incline, the
vehicle’s mark could deviate from its actual position.
(6) If there are continuous gradual curves in the same
direction, the vehicle’s mark could deviate from its
actual position.
(7) If the vehicle is driven in a zigzag pattern, such as
through frequent lane changes, the vehicle’s mark could
deviate from its actual position.
(8) If the vehicle is placed on a turntable, such as in a
parking area, and turned with the ignition OFF, the
vehicle’s mark could deviate from its actual orientation.
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