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Special Radio Features
• In temperature extremes outside the operating limits of your RSM.
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.
Furthermore, please note that even where adequate signals from 
multiple satellites are available, your GPS feature will only provide an 
approximate location, often within 20-100 meters from your actual 
location, but sometimes much further from the actual location.
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.
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 RSM.
Enhancing GPS Performance
Sometimes, the GPS feature of your RSM may be unable to complete 
a location calculation successfully. You will then see a message 
indicating that your RSM cannot see enough visible satellites.
To maximize the ability of your RSM to determine a fix, please note 
the following guidelines:
• Stay in the open. The GPS feature works best where there is 
nothing between your RSM and a large amount of open sky.
• Wear your RSM outside all clothing. Keep it as high on your body 
as possible, ideally at shoulder level.
94C06.book  Page 84  Wednesday, June 23, 2010  11:41 AM