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Chapter 4: Setting Up the GPS Plotter 4-13
➤ 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
The D-GPS SET UP function is only available when a Differential GPS
receiver is connected and the unit is set as a GPS Source repeater (see
GPS Source on page 4-8). It provides the ability to set up an external
Differential GPS, either automatically (default) or by manually
retuning it to a different differential beacon.
Note: If the display unit is receiving RTCM data via the NMEA input
port, repeating a differential fix from another unit, the D-GPS SET UP soft
key is grayed out. If receiving RTCM data, set up must be performed
manually on the external DGPS receiver.
➤ To set up a D-GPS:
Press the D-GPS SET UP soft key.
The D-GPS SET UP screen is displayed as shown in Figure 4-3.
Figure 4-3: D-GPS Set Up Screen
DIFFERENTIAL GPS SET UP
SET BEACON FREQ.
287.5 kHz
MODE
BEACON ID
BEACON FREQUENCY
BIT RATE
SIGNAL STRENGTH
SIGNAL/NOISE RATIO (SNR)
DIFFERENTIAL AGE
AUTO
1024
287.5kHz
100 bps
50dB
30dB
2 s
MODE
AUTO MAN
BIT RATE
100 bps
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