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4-12 Raynav 300 GPS Plotter
4.5 GPS Set Up
The GPS set up page provides information for the status of the tracked
navigation satellites plus HDOP and satellite Fix Status. It also provides
the ability to set up a Coastal GPS by manually retuning it to a different
differential beacon.
➤ To select GPS Set Up:
1. Press the GPS SET UP soft key to display the GPS Navigation Status
screen with associated soft keys as shown in Figure 4-2:
Figure 4-2: GPS Status Screen
The GPS Navigation Status screen provides, for each tracked satellite,
the satellite number, a graphical signal strength bar and its current usage
status. Data for up to 12 satellites are shown.
Positional accuracy is dependent upon certain parameters; in particular
for GPS, the azimuth and elevation angles are used in a triangulation
process to calculate position. HDOP (Horizontal Dilution Of Position) is
a measure of this accuracy; a higher figure signifies greater error. In ideal
circumstances, the figure should be in the region of 1.0. The Fix Status
can indicate:
• FIX, where a satellite fix has been acquired.
• D-FIX, where a differential beacon fix has been acquired.
• SD-FIX, where a satellite differential fix has been acquired.
• NO FIX, where no fix can be acquired.
Fix Mode
Fix Mode provides selection of the method used to acquire a position fix.
D-GPS
SET UP
GPS STATUS
HDOP FIX STATUS
SAT SIGNAL STATUS
15
09
08
10
20
17
LOCKED
IN USE
IN USE
LOCKED
LOCKED
LOCKED
1.0 D-FIX
SAT SIGNAL STATUS
23
18
26
12
14
03
LOCKED
IN USE
IN USE
LOCKED
LOCKED
LOCKED
D5551_1
RESTART
GPS
FIX MODE
GPS D SD