Advanced Features
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69
Global Positioning System (GPS) Enabled
Your RSM’s GPS Enabled feature uses information from the
Global Positioning System (GPS) satellites orbiting the Earth to
determine the approximate geographical location of your RSM,
expressed as latitude and longitude. 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 very 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.
Understanding the GPS Feature
The GPS technology uses radio signals from earth orbiting
satellites, to establish the location co-ordinates, 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 RSM will not
work. Such situations include but are not limited to:
• In 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
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 only
provides 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.
6875945M01-A_Full.book Page 69 Tuesday, July 8, 2008 12:54 AM
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