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2.15
Global Positioning System/Global Navigation Satellite System
NOTICE: This feature is addressed as GPS across the manual as the naming convention of the
buttons and strings remain the same as the legacy feature of GPS.
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.
2.15.1
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
•
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.
2.15.2
GPS Performance Enhancement
Sometimes, the GPS feature may be unable to complete a location calculation successfully. You then
see a message indicating that your radio cannot connect to enough visible satellites.
To maximize the ability of your radio to determine a fix, take note of the following guidelines:
•
For your initial fix, hold the radio in the face position.
•
Stay in the open. The GPS feature works best where there is nothing between your radio and the
open sky.
68007024014-GK
Advanced Features
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