Raymarine 530 - Manual (Page 98)

4-8 SL520/530/631 PLUS Chartplotter Displays
GPS Setup
4.6 GPS Setup
GPS set up page provides you with information and the status of the tracked
navigation satellites for a SeaTalk GPS. It also enables you to SET UP a SeaTalk
Differential GPS, by manually retuning it to a different differential beacon.
The GPS Navigation Status pop-up window (shown in Figure 4-4) provides,
for each tracked satellite, the satellite number, a graphical signal strength bar
and its current usage status. HDOP and satellite Fix Status are also displayed.
Data for up to 12 satellites are shown.
Figure 4-4: Navigation Status Window
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.
➤ To select GPS Set Up:
Press MENU, then press the GPS SETUP... soft key.
The Navigation Status pop-up window shown in Figure 4-4 is displayed.
NAVIGATION STATUS
SAT
D4281-2
SIGNAL STATUS AZ ELEV
03
31
21
23
22
19
17
27
16
15
IN USE
IN USE
IN USE
IN USE
IN USE
IN USE
IN USE
SPARE
SPARE
SPARE
085
292
127
075
174
290
056
321
024
237
085
051
048
043
028
014
012
011
005
065
RESTART
GPS
D-GPS
SETUP¬
FIX STATUS
FIX
HDOP
1
MENU
GPS
SETUP¬