Magnet Compass Correction (Mag Compass Setting) - JRC JMA-9123-7XA Instruction Manual

3.4.15.2 Input the own ship speed (Manual Speed)
If the ship-speed system, such as LOG, etc., connected to this radar system
malfunctions, it is possible to manually enter own ship speed by the method
described below to use the target tracking (TT) and true motion display functions.
Procedures
1) Left-click the own ship speed device button in the Own Ship
Information area located at the upper right of the display, and
select the manual mode
Left-click the value of the speed.
2)
The numeric value input screen will open to enter the own ship speed.
3) Enter the value for the own ship speed on the numeric value
input screen.
For how to input numeric data on the numeric value input screen, see Section 3.3.4
"Operation on Numeric Value, Latitude / Longitude and Character Input menu".
3.4.16

Magnet Compass Correction (MAG Compass Setting)

Set the correction value, when the radar receive HDM sentence from magnet
compass or the variation of HDG is NULL.
Procedures
1) Open the MAG Compass Setting menu by performing the
following menu operation.
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JMA-9100 Instruction Manual 3.BASIC OPERATION
NOTE: •If the single axis water log display can present the speed of
the ship in other than the forward direction, the direction of
movement should be indicated unambiguously. Therefore
single axis water logs cannot detect the effect of leeway.
•If ships in shallow water, when the accuracy of the dual-axis
log may be decreased. If ships in deep sea area, when the
accuracy of the dual-axis log error may be occurred.
•The accuracy of GPS's COG is ± 3° when own ships speed
no fewer than 1kn, no more than 17kn. The accuracy of
GPS's COG is ± 1° when own ships speed over 17kn.
MAN
Main
6.NAV Equipment Setting
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3－ 37
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3.4 GENERAL RADAR OPERATION
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2. MAG Compass Setting
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