User's Manual

GeoExplorer 2005 Series Getting Started Guide 21
Using GPS 8
The GeoExplorer 2005 series handheld provides an integrated GPS
receiver that enables you to use GPS data.
Note – Before you can use GPS, you may need to configure the
application to connect to GPS (see Configuring a GPS application,
page 23).
This section provides information on:
• getting a clear view of the sky (see page 22)
• GPS COM ports (see page 22)
• configuring a GPS application to connect to GPS (see page 23)
• configuring GPS quality control settings to suit your requirements
and the current GPS conditions (see page 24)
• using mission planning to identify the best times of the day for
working with GPS (see page 26)
• using real-time differential corrections for better accuracy
(see page 28)
• the level of accuracy provided by GeoExplorer 2005 series
handhelds (see page 29)
• factors that affect accuracy and how to improve accuracy
(see page 30)
• differential GPS (see page 32)
What is GPS?
The Global Positioning System (GPS) is a satellite-based positioning
system operated by the U.S. Department of Defense (DoD). A
constellation of operational NAVSTAR satellites orbit the earth every
12 hours, providing worldwide, all-weather, 24-hour time and
position information.
For more information about how GPS works, visit the Trimble
website at www.trimble.com/gps/.