Satellites - Navman Tracker 5430 Installation And Operation Manual

Change the numeric data display
1 In the highway display, press MENU and
select Data setup.
2 Change a data field:
i Press the cursor keys to highlight the
field.

7 Satellites

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 5 m (16.4 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 (16 ft) for 95% of
the time.
WAAS covers all of the USA and most of
Canada. EGNOS will cover most of Western
Europe.
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).
18
ii Press ENT to display a menu of the data
that can be shown in the field.
iii Select the data to show in the field; select
None to leave the field empty.
3 Repeat the above step to change other fields.
4 Finally, press ESC to return to the highway
display.
GPS antennas
• The TRACKER 5430i has a built in GPS antenna.
• The TRACKER 5430 must be used with an
external GPS antenna. It is recommended to
use the GPS antenna supplied.
• The TRACKER can apply the WAAS and
EGNOS DGPS corrections to any GPS antenna.
• Fit an optional differential beacon DGPS
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 TRACKER can use GPS satellite data from
a optional compatible instrument or antenna
connected by NavBus or NMEA (see sections
14 and 15-3). In this case, the TRACKER does
not need its own antenna.
To configure the TRACKER for different antenna
options, see section 13-3. For more information,
contact your NAVMAN dealer.
The TRACKER has a sensitive 12-channel receiver
built in, 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.
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.
NAVMAN
TRACKER 5430/5430i Installation and Operation Manual