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Magellan GPS 315/GPS 320 3
Getting Started
This section shows you how to use your receiver for the first time and
explains:
• Accuracy
• Battery Installation
• Primary Usage
• Getting a Fixed Position
Receiver Accuracy
The satellite constellation that provides the GPS information used by
the receiver is maintained by the Department of Defense (DoD). GPS
positioning, for general use, provides 25 meter RMS accuracy or better.
Since the signals generated by these satellites are publicly accessible, the
DoD has introduced errors in the satellite signals for security reasons.
These errors are referred to as Selective Availability (SA).
At present, your GPS position will be accurate within 100 meters
horizontally and 150 meters vertically. Due to these errors introduced
by SA, it is possible to get readings outside of these values at times.
Installing the Batteries
The receiver uses two AA batteries that are installed at the back. To
remove the battery cover, turn the ring of the battery door screw
counter-clockwise until the battery
cover can be removed.
Insert the new batteries as shown, being
sure to respect the polarities, and replace
the cover.
Replace the screw and turn the ring
clockwise until the battery door is held
in place securely. Avoid overtightening
the battery door screw.
Once the batteries have been removed,
the receiver loses time and date after 20 minutes.
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