About GPS
Global Position System (GPS) is a satellite system developed by the Department of
Defense of US. GPS consists of 32 satellites that circle the earth and are 11,000 miles
away from the ground. These satellites make two circles of the earth per day and emit
signals of extremely low power which will be received and recorded by 5 ground stations.
These ground stations will use precise time signals to confirm accurate position of each
satellite. Your GPS receiver can “pick” signals sent out by the satellites. An accurate
latitude, longitude and height can be determined through calculation on positions and
distances of at least 4 satellites.
WAAS (Wide Area Augmentation System) can enhance the precision of GPS. It was designed
by the Federal Aviation Administration and is mainly used to enhance precision of GPS on
planes. WAAS is combined with extra ground station groups that are set up in precisely
located places. These ground stations work together with a master console to improve
accuracy of satellite signals and reduce errors to about 3 meters.
Using Conditions
As Swami GT uses GPS, it is available only in the places that can receive satellite signals,
excluding places indoor or in water.
25
About GPS / Using Conditions
