Sony NAV-U NV-U81T Quick Start Manual page 7

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• Turn the unit off by pressing ?/1 (4),
take it out of the cradle, then disconnect
the car battery adapter, otherwise it may
drain the car battery.
Note the following.
If your car's cigarette lighter socket is
not connected to the ACC on your
ignition switch, power will continue to
be supplied to the unit's built-in power
supply even when the ignition is off or
the unit is not in use.
• Do not connect any accessory (car
battery adapter, AC power adapter, etc.)
other than those supplied or optional.
• Do not expose the unit to fire or water, as
it may cause a malfunction.
• Be sure to remove the unit out of the car
when leaving your car to prevent theft or
high temperature damage inside the car.
• Note that the built-in battery cannot be
charged outside the temperature range 5
– 45 ºC (41 – 113 ºF).
• Do not leave the unit in high ambient
temperature as the built-in battery
capacity will deteriorate, or it will
become unchargeable.
On GPS
GPS (Global Positioning System)
satellites continuously emit signals for
positioning anywhere on the earth. As a
GPS antenna receives these signals, users
can be informed of their location (latitude,
longitude and altitude). Information must
be received from 3 satellites in order to
obtain two-dimensional fixes (latitude and
longitude), and 4 satellites are required for
three-dimensional positioning (latitude,
longitude and altitude). As GPS satellites
are controlled by the U.S. Department of
Defense, a deliberate margin of error
between a few meters (a few feet) and 10
meters (32.8 feet) exists. As a result, the
GPS navigation system may include an
error of between 10 meters (32.8 feet) and
about 200 meters (656.2 feet), depending
on the circumstances.
As GPS information is obtained using
signal from satellites, it may be impossible
or difficult to obtain the information in the
following locations:
• Tunnel or underground
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