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Section 3 Operation
GPS SETTING
•In this item, you can perform the initial settings when JRC’s GPS/
DGPS sensor GPS112 or DGPS212 is connected to the RADAR
1800. The menu includes both basic settings and initial settings. The
basic settings reflect the general GPS/DGPS sensors and the initial
settings reflect the beacon module of the DGPS sensor. Before setting,
you need to set the clock built in the plotter using CLOCK ADJUST.
Note:
•Use TX COMMAND to send the values set in the following settings.
VESSEL POSITION (Setting the vessel position)
•In this menu, you can set your vessel’s current position. It will take
about 20 minutes to complete the positioning through the GPS/
DGPS when you turn the power on for the first time or after you
perform the master reset. You can save time, however, by setting your
vessel’s position, as well as time difference and antenna height
described below.
TIME DIFFERENCE (Setting the time difference)
•In this menu, you can set the time difference between UTC
(Universal Time Coordinate) and the local time.
ANTENNA HEIGHT (Setting the antenna height)
•In this menu, you can set the antenna height (from the sea level) of
the GPS/DGPS sensor.
GEODETIC DATUM (Setting a geodetic system)
•In this menu, you can set the data type of the Geodetic System the
GPS/DGPS sensor uses. In preparing charts or maps, cartographers
rely on a particular geodetic datum or scaling system (Geodetic
System) on which to calibrate the Latitude/Longitude coordinate
structure onto their charts. The GPS/DGPS sensor also calculates the
vessel’s position using the same Geodetic System. If the data type used
in the Geodetic System by cartographers and the GPS/DGPS differ,
the positions calculated by the GPS/DGPS may be considerably
different, up to 200 m, from those in the charts. Therefore, it is
necessary to set this item so that both sides use the same data type.
The data type used is normally listed in the margin on the chart. Set
the same data type.
There are 46 types of data available currently. (Refer to “Geodetic
System Table” p.140)
FIX MODE (Setting the fixing mode)
•In this menu, you can set the geodetic mode of the GPS/DGPS
sensor. When the GPS is connected, 3D provides more precise data
than 2D. When the DGPS212 is connected, the AUTO mode is
selected regardless of this setting.
GPS SETTING
N 0° 00.000'
E 0° 00.000'
+
00:00
0.0m
WGS-84
AUTO
10
2S
00 00 00
00 00 00
POSITION
TIME DIFF.
ANTENNA HEIGHT
GEODETIC DATUM
FIX MODE
HDOP LEVEL
AVERAGE
EXCLUDE SAT.
TX COMMAND
95


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