B&G H5000 Pilot Computer - Manual (Page 55)

| 55 Sensor calibration | H5000 Operation Manual
Heading (compass)
Auto Cal
The compass Auto Cal process records the magnetic fi elds in the yacht that cause deviation
errors. It calculates the corrections when the compass calibration is started provided the
following conditions are met:
• The 360º turn - RC42 compass or 2 x 360º turn Halcyon Gyro Stabilized compass is completed
in the same direction.
• The rate of change of heading does not exceed 3º/s; i.e. the turn should take about 2 minutes
to complete.
• The rate of change of heading must not fall below 0.2 °/s during the 360° turn, i.e. the turn
must not take longer than 12 minutes.
• The rate of change in heading is reasonably constant.
• 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.
large motors).
• 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 eff ects of pitch and roll are at
their greatest.
• On steel hulled vessels, the compass will need to be installed above decks away from the
eff ects of the hull.
1 Select Auto Cal
2 Select Calibrate
3 Steer the vessel through 360º maintaining a steady rate of turn