4-12
Raychart 320 Chartplotter
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.
➤
To select the required Fix Mode:
1. Press the
FIX MODE
soft key repeatedly to cycle through the available
modes.
i. Select
GPS
to calculate a fix using GPS data only.
ii. Select
D
to calculate a fix using Differential GPS data from an
external RTCM beacon receiver.
iii. Select
SD
to calculate a fix using Satellite Differential data, if
available.
2. Press
CLEAR
to exit.
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
81167_3.BOOK Page 12 Wednesday, November 21, 2001 2:12 PM
Содержание Raychart 320
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