NORTHROP GRUMMAN NAVIGAT X MK 1, Operation, Installation And Service Manual

Page: 62 / 110

056343/C NAVIGAT X MK 1
6-8 Alignment Error Correction
Determining magnetic heading correction values
1. Make sure that the magnetic variation is set to 0.0° in the Manual
Settings menu.
2. Make sure that the calibration is disabled (setting ’OFF’ selected in
the User Setup / Magn. Cal. Tab.)
3. Select a manual steering mode.
4. Commence a continuous, very slow and steady turn. The vessel
must be swung through one full circle (360°) at least.
5. While the vessel is turning, com-
pare the indication at the steer-
ing magnetic compass with the
magnetic heading values shown
on the NAVIGAT X MK 1 display.
At every full 10° of steering
magnetic compass heading (0°,
10°, ... , 350°), note the display
value.
6. Enter the observed display val-
ues in the magnetic heading cal-
ibration table (blank form
included in the appendix of this
manual).
7. Calculate the required correc-
tion value for each heading
value.
The correction value is the offset
which must be applied to a
given display value in order to
obtain the steering magnetic
compass heading.
Example:
steering magnetic compass
heading = 0°,
display value = 0,8°,
correction value = –0,8°.
0
Mag. Compass
Heading
Mag. HDG
Display
(uncalibrated)
Correction
Value
10
!"
!'"
!#$"
%"
0
Mag. Compass
Heading
Mag. Hdg.
Display
(uncalibrated)
Correction
Value
10
0˚
Mag. Compass
Heading
Mag. Hdg.
Display
(uncalibrated)
Correction
Value
10˚
– mag. hdg. display
= correction value
mag. compass hdg.