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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.
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
Navigation Plan. These changes may affect the performance of the GPS feature on your radio.
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.
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