056373/D
NAVIGAT 100
6-14
Magnetic Compass Calibration
6.8 Magnetic Compass Calibration
Ideally, the magnetic compass heading displayed at the NAVIGAT 100
would exactly match the indication of the steering magnetic compass (at
a given magnetic variation of 0.0°).
In practice, however, deviations will occur between the steering mag-
netic compass heading and the reference heading data, as displayed at
the NAVIGAT 100 CDU.
The NAVIGAT 100 corrects such deviations using a a magnetic calibra-
tion table. The entries of the magnetic calibration table must have been
previously determined and stored and „USE CAL. TAB“ (use Magnetic
Calibration Table) Calibration must be checked in the User Setup.
Calibration Procedure Overview
The magnetic compass calibration is a two-step procedure:
•
At first, the existing deviations between the indication of the steering
magnetic compass and the magnetic compass heading displayed at
the NAVIGAT 100 must be determined. This requires that the vessel
is swung very slowly through a full circle so that for each 10° of mag-
netic compass heading (0, 10, …, 350°) the corresponding display
value is obtained.
•
Secondly, the resultant correction values are calculated and entered
into the magnetic compass heading calibration table of the
NAVIGAT 100 gyrocompass, see “MAGN (Magnetic Compass) SEN-
SOR SETUP” on page 7-24 for details.
CAUTION
Risk of inaccurate magnetic compass calibration
The magnetic compass heading calibration corrects deviations due to the
combined effects of the magnetic environment, the particular sensor
being used and the receiving circuitry on the NAVIGAT 100 mainboard.
Therefore, a new calibration must always be carried out when:
- the steering magnetic compass is exchanged or newly adjusted,
- the magnetic compass heading sensor is exchanged and,
- when the NAVIGAT 100 mainboard is exchanged.
Never use a true heading source, e.g. a gyrocompass, as the calibration
reference.
Never attempt to correct residual deviations of a properly adjusted mag-
netic compass by means of the calibration table.
Note
If magnetic compass heading is received from an already calibrated
source, such as a NAVITWIN, NAVIPILOT or a self-calibrating electronic
compass, magnetic compass calibration at the NAVIGAT 100 is not
required and must be disabled.
CAUTION
Risk of inaccurate magnetic compass calibration
The magnetic compass used as the calibration reference must be prop-
erly installed and adjusted.
The procedure should be carried out in calm seas only.
Содержание NAVIGAT 100
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