Sperry Marine NAVIGAT 100, Operation, Installation And Service Manual

Page: 115 / 212

NAVIGAT 100 056373/D
Magnetic Compass Calibration 6-15

The magnetic compass heading calibration table stores up to 50
entries (’cal. no.s’), each entry assigns a correction value to a given
magnetic compass heading (0, 10, …, 350°).
Determining magnetic compass heading correction values
1. Go to the ”Manual Settings Menu” on page 2-20. Make sure that the
magnetic variation mode is set to manual mode and 0.0° is entered
as magnetic variation value.
2. Go to the ”Service Setup 600” ”MAGN (Magnetic Compass) SEN-
SOR SETUP” sub menu on 7-24.
Make sure that the „USE CAL. TAB (Use Calibration Table) check box
is unselected (OFF).
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 compass heading val-
ues shown on the NAVIGAT 100
display.
At every full 10° of steering
magnetic compass heading (0°,
10°, …, 350°), note all the dis-
played values.
6. Enter the observed display val-
ues in the magnetic compass
heading calibration 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
256.4
°
DATE/TIME: AUTO
29.JAN.2013
15:54
MAGN
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.