B&G H2000 Pilot *DISCONTINUED* - Manual (Page 78)

HB-0844-04
3-13
3.4 COMPASS CALIBRATION
3.4.1 Principles of Compass Calibration (Super Halcyon 3, Halcyon
2000 & Halcyon Gyro Stabilised Compasses)
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 540° turn - Super
Halcyon 3 or 360
°
turn - Halcyon 2000, provided the following conditions are
met:
(a) The 540° turn - Super Halcyon 3 or 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 540° turn - Super Halcyon 3, i.e. the
540° turn must not take longer than 45 minutes.
(d) The rate of change in heading is constant.
(e) Automatic calibration has been utilised by connecting the brown
wire from the compass at the junction box. (Super Halcyon 3 only)
(f) The compass is installed in a location free from magnetic
interference such as iron keels, engines, loudspeakers etc.
Consideration should also be given to electrical cables which may
carry excessive currents (e.g. navigation lights).
(g) The compass is installed in a location as close to the centre line
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.
(h) On steel hulled vessels, the compass will need to be installed
above decks away from the effects of the hull. Ideally, the compass
should be installed 4-5m (12-16ft) above deck level.