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TRACKFISH 6600 Installation and Operation Manual 31
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 TRACKFISH 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 TRACKFISH’s standard GPS antenna.
The accuracy of the corrected GPS position
is typically better than 5 m (16 ft) for 95% of
the time.
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 antennas
The TRACKFISH must be used with an external
GPS antenna:
Normally, use the GPS antenna supplied.
Fit an optional differential beacon DGPS
7 Satellites
antenna to give enhanced accuracy within
range of land based differential beacons
in areas where WAAS or EGNOS are
not available. Such a DGPS antenna
has both a GPS receiver and a beacon
receiver, and it automatically applies the
beacon correction to the GPS position.
The TRACKFISH can use GPS satellite
data from a optional compatible
instrument or antenna connected by
NavBus or NMEA (see section 16-6). In
this case, the TRACKFISH does not need
its own antenna.
To configure the TRACKFISH for different
antenna options, see section 15-4. For more
information, contact your Navman dealer.
Startup
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.
30


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