THE GLOBAL POSITIONING SYSTEM (GPS) is a network of
24 navigation satellites orbiting the Earth that people can
use to pinpoint their position. The satellites orbit at a height
of 20,000 kilometres (12.500 miles). A GPS receiver picks up
signals from any of these satellites that are above the horizon.
It uses information in each signal to work out how far away it
is from the satellite. Tt can calculate its position on the Earth's
surface when it has information from at least three satellites.
A basic GPS receiver shows the latitude and
longitude of its position on its screen. More
advanced receivers, especially those designed
for use in vehicles, show their position on a
digital map. These receivers often show extra
Poi
information, such as the vehicle's speed and
the length of the journey. Some receivers
warn drivers if they exceed the speed limit
for a road and even tell drivers which
traffic lane to use at the next junction.
These
Directions are shown on the screen and
also spoken by a synthesized voice.
24 navigation satellites orbiting the Earth that people can
use to pinpoint their position. The satellites orbit at a height
of 20,000 kilometres (12.500 miles). A GPS receiver picks up
signals from any of these satellites that are above the horizon.
It uses information in each signal to work out how far away it
is from the satellite. Tt can calculate its position on the Earth's
surface when it has information from at least three satellites.
A basic GPS receiver shows the latitude and
longitude of its position on its screen. More
advanced receivers, especially those designed
for use in vehicles, show their position on a
digital map. These receivers often show extra
Poi
information, such as the vehicle's speed and
the length of the journey. Some receivers
warn drivers if they exceed the speed limit
for a road and even tell drivers which
traffic lane to use at the next junction.
These
Directions are shown on the screen and
also spoken by a synthesized voice.
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