User's Manual

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.
Once GPS is enabled, the radio displays the GPS
icon on the screen. The dispatcher can always
request the system to determine the real-time location
coordinates of the radio.
GPS Operation
The GPS technology uses radio signals from earth
orbiting satellites, to establish the location
coordinates, maximizing your view of clear
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 of buildings, trains, or other covered
vehicles
• Under any other metal or concrete roof or
structure
•
Between tall buildings or under dense tree-cover
• 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.
Note
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
Advanced Features
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