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The availability and accuracy of this location information
(and the amount of time that it takes to calculate it) varies
depending on the environment in which you are using the
GPS feature.
For example, GPS location fixes are difficult to obtain
indoors, in covered locations, between high buildings, or in
situations where you have not established a clear broad
view of the sky.
GPS Operation
The GPS technology uses radio signals from earth orbiting
satellites to establish location coordinates. Therefore,
maximizing your view of unobstructed sky is essential for
optimum performance.
Where adequate signals from multiple satellites are not
available (usually because you cannot establish a view of a
wide area of the sky), the GPS feature of your radio will not
work. Such situations include but are not limited to:
•
Underground locations
•
Inside buildings, trains, or covered vehicles
•
Under any metal, or concrete roof, or structure
•
Between tall buildings or under dense tree-cover
136
•
In temperature extremes outside the operating limits of
your radio
Even where location information can be calculated in such
situations, it may take longer to do so, and your location
estimate may not be as accurate. Therefore, in any
emergency situation, always report your location to your
dispatcher.
Keep in mind that the accuracy of the location information
and the time it takes to obtain it varies depending upon
circumstances, particularly the ability to receive signals
from an adequate number of satellites.
NOTICE:
Even where adequate signals from multiple
satellites are available, your GPS feature only
provides an approximate location, usually within 10
meters from your actual location, but sometimes
farther away.
The satellites used by the GPS feature are controlled by
the U.S. government and are subject to changes
implemented in accordance with the Department of
Defense GPS user policy and the Federal Radio Navigation
Plan. These changes may affect the performance of the
GPS feature on your radio.
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