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TRACKER 5505/5505i/5605 Installation and Operation Manual
28
NAVMAN
GPS worldwide navigation
The US Government operates the GPS system.
Twenty-four satellites orbit the earth and
broadcast position and time signals. The
positions of these satellites are constantly
changing. The GPS receiver analyses the
signals from the closest satellites and
calculates exactly where it is on earth. This is
called the GPS position.
The accuracy of the GPS position is typically
better than 10 m (33 ft) for 95% of the time. A
GPS antenna can receive signals from the GPS
satellites when it is almost anywhere on earth.
DGPS
A DGPS system uses correction signals to
remove some of the errors in the GPS position.
The TRACKER can use one of two types of
DGPS system:
WAAS and EGNOS DGPS
WAAS and EGNOS are two satellite based
DGPS systems. The correction signals are
broadcast by satellites and are received by
the TRACKER’s standard GPS antenna. The
accuracy of the corrected GPS position is
typically better than 5 m (15 ft) for 95% of
the time.
7 Satellites
WAAS covers all of the USA and most of
Canada. EGNOS will cover most of Western
Europe when it becomes operational.
Differential beacon DGPS
Differential beacons are land based radio
transmitters that broadcast correction
signals that can be received by a special
receiver on the boat. Differential beacons
are usually only installed near ports and
important waterways, and each beacon
has a limited range. The accuracy of the
corrected GPS position is typically better
than 2 to 5 m (6 to 16 ft).
GPS receiver
Navman GPS units have a sensitive 12-channel
receiver, which tracks signals from all GPS
satellites visible above the horizon and uses
measurements from all satellites more than 5°
above the horizon to calculate the position.
Each time a GPS receiver is turned on, it
normally takes about 50 seconds before
it outputs the first position. Under some
circumstances it will take up to two minutes
or longer.
28


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