B&G H2000 Pilot *DISCONTINUED* - Manual (Page 103)

HB-0845-06 103
3.5 COMPASS CALIBRATION
3.5.1 Principles of Compass Calibration
B&G's Autoswing compasses contain software that allows
them to record the magnetic fields in the yacht that are
causing the deviation errors. It calculates the corrections
every time the boat completes a 360
°
turn, provided the
following conditions are met:
a. The 360
°
turn - Halcyon 2000 & Halcyon Gyro
Stabilised Compass is completed in the same
direction.
b. The rate of change of heading does not exceed
3°/s; i.e. the turn should take about 3 minutes to
complete.
c. The rate of change of heading must not fall below
0.2 of a degree per second during the 360° turn,
i.e. the turn must not take longer than 12 minutes.
d. The rate of change in heading is constant.
e. The compass is installed in a location a safe
distance from magnetic interference such as iron
keels, engines, loudspeakers etc. Consideration
should also be given to electrical cables which
may carry high currents (e.g. navigation lights).
f. The compass is installed in a location as close to
the centreline of the boat as possible. Avoid areas
such as the fore peak and the sides of the hull
where the effects of pitch and roll are at their
greatest.
g. On steel hulled vessels, the compass will need to
be installed above decks away from the effects of
the hull.