Dennis's Electronics on eBay specializes in Consumer Electronics such TomTom GPS,
Garmin GPS, Magellan Maestro GPS, Nextar Global Positioning Systems and much more!
Click here to visit Dennis's Electronics for more information.

Using hand held GPS devices when hiking, driving, walking, hunting, skiing,
boating, flying airplanes, and other outdoor activities are exceptional
ways to stay safe by protecting you and your family from getting lost.
There have been so many cases of people all over the world getting
lost or hurt when hunting, skiing, hiking, and other outdoor activities.

Years ago, there were only a few technological devices used for one to
get help when they are lost or injured such as cell phones, walkie talkie
cb radios, or  hand held 2 way radios.

These devices are great to use for communication, but sometimes these devices
can fail due to lost signal and if you get lost somewhere, how can you give
your rescuers the correct location as to where you are lost?

Global Positioning Systems are the newest advancements in technology that
are helping people all over the world to navigate anywhere anytime
better than ever before!

What is a Global Positioning System (GPS)?

The Global Positioning System (GPS) is a U.S. space-based radio navigation
system that provides reliable positioning, navigation, and timing services
to civilian users on a continuous worldwide basis -- freely available to all.
For anyone with a GPS receiver, the system will provide location and time.
GPS provides accurate location and time information for an unlimited number
of people in all weather, day and night, anywhere in the world.(GPS.gov)

The GPS is made up of three parts: satellites orbiting the Earth; control
and monitoring stations on Earth; and the GPS receivers owned by users.
GPS satellites broadcast signals from space that are picked up and identified
by GPS receivers. Each GPS receiver then provides three-dimensional location
(latitude, longitude, and altitude) plus the time.(GPS.gov)

Individuals may purchase GPS handsets that are readily available through
commercial retailers. Equipped with these GPS receivers, users can accurately
locate where they are and easily navigate to where they want to go, whether walking
driving, flying, or boating. GPS has become a mainstay of transportation systems
worldwide, providing navigation for aviation, ground, and maritime operations.(GPS.gov)

Disaster relief and emergency services depend upon GPS for location and timing
capabilities in their life-saving missions. Everyday activities such as banking,
mobile phone operations, and even the control of power grids, are facilitated by
the accurate timing provided by GPS. Farmers, surveyors, geologists and countless
others perform their work more efficiently, safely, economically, and accurately
using the free and open GPS signals.(GPS.gov) 

***BELOW ARE MORE DETAILS ABOUT GPS***

The Global Positioning System (GPS) is a U.S.-owned utility that
provides users with positioning, navigation, and timing (PNT) services.
This system consists of three segments: the space segment, the control
segment, and the user segment. The U.S. Air Force develops, maintains,
and operates the space and control segments.(GPS.gov) 

The space segment consists of a nominal constellation of 24 operating
satellites that transmit one-way signals that give the current GPS satellite
position and time. The control segment consists of worldwide monitor and
control stations that maintain the satellites in their proper orbits through
occasional command maneuvers, and adjust the satellite clocks. It tracks
the GPS satellites, uploads updated navigational data, and maintains health
and status of the satellite constellation. The user segment consists of the
GPS receiver equipment, which receives the signals from the GPS satellites
and uses the transmitted information to calculate the user’s three-dimensional
position and time.(GPS.gov)

GPS satellites provide service to civilian and military users. The civilian
service is freely available to all users on a continuous, worldwide basis.
The military service is available to U.S. and allied armed forces as well
as approved Government agencies.(GPS.gov)

A variety of GPS augmentation systems and techniques are available to enhance
system performance to meet specific user requirements. These improve signal
availability, accuracy, and integrity, allowing even better performance than
is possible using the basic GPS civilian service.(GPS.gov) 

The outstanding performance of GPS over many years has earned the confidence
of millions of civil users worldwide. It has proven its dependability in the
past and promises to be of benefit to users throughout the world far into
the future.

References
Global Positioning Systems, n.d., Retrieved July 10, 2008 from gps.gov [Website]

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 Dennis's Electronics on eBay specializes in Consumer Electronics such TomTom GPS,
Garmin GPS, Magellan Maestro GPS, Nextar Global Positioning Systems and much more!
Click here to visit Dennis's Electronics for more information.