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36 |
System configuration |
MX610/MX612 Operator and Installation manual
GPS/GPS+GLONASS selection
By default, the SIMRAD CDU is set to navigate using the GPS satellite system. When using the
MX521B smart antenna or the HS80A/MX575D smart D/GPS compass models, the SIMRAD
CDU can be controlled to navigate using combined solutions from GPS and GLONASS satel-
lites.
Setup procedure to use GPS and GLONASS (or GNSS) satellites:
1.
Press the
MENU
key.
2.
Scroll Tools & Settings menu, press
ENT
.
3.
Scroll to GPS icon, press
ENT
.
4.
Scroll to GNSS Mode, press
ENT
.
5.
Scroll to GPS+GLONASS, press
ENT
.
6.
Press the
CLR
key repeatedly (or press any hot key) to exit.
7.
The GP (GPS) icon in the status bar will change to GN when position solution from combined
GPS & GLONASS becomes available. Also, the NMEA 0183 message header is changed from
$GPxxx to $GNxxx.
DGPS Mode
The DGPS mode controls the implementation of DGPS corrections to the GPS receiver. The
three differential modes are Off, WAAS and Beacon. WAAS is also known in general term as
SBAS (Satellite Based Augmentation System). This includes WAAS, EGNOS, MSAS and other
satellite based GPS correction systems implemented by host countries. SBAS correction is
not recognized by IMO and should not be used in lieu of the land-based differential station
signals. It is recommended to turn the DGPS mode to OFF when navigating in areas where
the land-based differential beacon signals are not available. In addition to the DGPS control,
a Mixed mode setting can be used to allow position solution to be derived from differentially
corrected satellites as well as un-corrected satellites. This is a good feature in areas where
partial correction is the only available option.
The source of DGPS correction for the MX521A/B antenna model can be controlled using the
procedure below:
1.
Press the
MENU
key.
2.
Scroll to Tools & Settings menu, press
ENT
.
3.
Scroll to GPS icon, press
ENT
.
4.
Scroll to DGPS mode, press
ENT
.
5.
Scroll to OFF, Beacon, WAAS or Ext. RTCM, press
ENT
.
6.
Press any hot key to exit.
¼
Note:
External RTCM data and connection for the
MX521A/B antenna model is shown in the diagram be-
low. Connection of the RTCM +/- is directly done to the
gray and purple wires of the MX521 antenna cable.
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