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• Compatible DeLorme Mapping SoftwareInstructions for sending maps to your Earthmate
GPS PN-20 vary by application. For more information, see the mapping application’s Help
system for instructions on sending maps to your Earthmate GPS PN-20.
• Online Map Cutter for Earthmate GPS PN-20Visit http://data.delorme.com. You must
have an Internet connection to use this website. For instructions on sending maps to your
Earthmate GPS PN-20 with this online application, see the Online Map Cutter for Earthmate
GPS PN-20 Help system.
You can transfer many types of data, such as satellite imagery, aerial imagery, USGS Topo Quad
maps, NOAA nautical charts, and more. Save maps in internal memory or on a removable memory
(SD/SDHC) card in the Maps directory.
Step 5 — Use the Pages to Track, View Your Position While You Travel, and More
This manual describes all of the functions found in each page on the Earthmate GPS PN-20. See
the Table of Contents to nd the headings that are most important to you.
About GPS
What is GPS?
The Global Positioning System (GPS) applies modern technology to the ancient art of navigation.
The U.S. Department of Defense has developed and launched a series of positioning satellites in
an orbiting “constellation.” These satellites are used as reference points much the same way stars
have been used in conventional navigation.
Using these satellites, a GPS receiver can determine your position anywhere on the globe. GPS
provides accurate information about coordinate position, elevation, speed, and direction of travel.
Many people have discovered the benets of GPS for recording tracks and much more.
How Does GPS Work?
The GPS constellation consists of at least 24 satellites, each carrying several atomic clocks to
ensure the most accurate time possible. The satellites broadcast low-power radio waves containing
the satellite’s identity code and the exact time (to the nanosecond) that the message was sent.
When a GPS receiver picks up a satellite signal, it identies the satellite and compares the signal
time with its own clock. The time difference represents the time it has taken for that radio wave to
Note:Largemapsmaytake
longertotransfertothedevice.
Tip:Whileitisfastertoaccess
mapsthathavebeensavedto
internalmemory,thequickest
waytotransfermapstoyour
deviceistocopythemaples
toanSDcardwithanSDcard
reader.
8


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