DeLorme PN-20 User Manual

Page 22

• Red—Indicates your GPS receiver is tracking the satellite, but it is not receiving data from it.
• Green—Indicates your GPS receiver is tracking the satellite, ephemeris data is available, and

the satellite is being used for navigation.

• Blue—Indicates your receiver is tracking the satellite, ephemeris data is available, the satellite

is being used for navigation, and the satellite has WAAS corrections available.

GPS Accuracy
The GPS accuracy displays in the lower-left corner of the screen in feet or meters, depending on

the measurement preferences you assigned in the Device Setup Page (see To Modify the Units

Settings on page 72 for more information). GPS accuracy is represented on the map by a circle with

a radius equal to the GPS accuracy, allowing you to see a representation of your accuracy in relation

to your map scale. The accuracy of the Earthmate GPS PN-20 is +/- 10 meters.
Battery Indicator
The battery indicator is a graphic representation of the current available battery power:

• Four green bars—Indicates a full charge.
• Three green bars—One quarter of the battery power has been used.
• Two yellow bars—One half of the battery power has been used.
• One red bar—Three quarters of the battery power has been used. Once the battery has

reached 5% of its total battery power, a low battery warning displays.

While the Li-Ion battery is charging, the battery indicator graphic is animated and the word “Bat-

tery” is replaced with “Charging.” Once the battery is fully charged, the battery indicator graphic

displays four static green bars and the word “Charging” is replaced with “External” until the charg-

ing cable is removed.

The Satellites Page

Battery indicator label changes

to “external” when charging

Note:

WAAS was developed

by the Federal Aviation

Administration to enhance

the accuracy—usually to

within three meters of actual

position—of GPS receivers

by providing a modified GPS

signal. After calculating the er-

ror factor at ground control sta-

tions throughout the U.S., the

corrected signal is transmitted

to two geostationary satellites

that in turn transmit the GPS

signal back to Earth.