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Receiver Accuracy. Before beginning, just a few words on the accuracy
of your receiver. The satellite constellation used to provide the GPS
information that your receiver uses was put into orbit and is maintained
by the Department of Defense (DoD) for use by the U.S. armed forces
and its allies. GPS positioning for general use produces an accuracy of 25
meters or better, far more accurate than anyone anticipated. Since the
signals generated by these satellites are accessible to anyone, the DoD
has introduced errors into the signals sent by the satellites for security
reasons. These errors are referred to as Selective Availability (or SA).
At present, your GPS position will be accurate to within 100 meters
horizontally and 150 meters vertically. This accuracy can be improved by
using Differential GPS (DGPS), which is described later in the manual. SA
means that 95% of the time, your horizontal coordinates will be within
100 meters of your actual position. Elevation may vary even further.
Connecting Receiver Power
Connecting Power to the Meridian XL. The Meridian XL receiver
operates on either three AA batteries or a 9-16 volt DC external power
source. Before using the Magellan Meridian XL GPS receiver, you need to
install the batteries by removing the battery compartment door as shown.
While the battery compartment was designed to be moisture resistant, it
is not sealed and will not prevent moisture from entering with prolonged
exposure. Even when operating the Meridian XL with external power, the
batteries are required to prevent loss of data if you should lose external
power for any reason.
Insert the batteries as shown in
the receiver and reinstall the
battery cover. You are now
ready to turn the receiver on.
The receiver’s memory has internal protection for power loss of
up to 10 minutes. This allows you to change the batteries
without losing the receiver’s memory provided that you change
the batteries within the 10 minute time frame.