B&G H2000 Pilot *DISCONTINUED* - Manual (Page 87)

HB-0844-04
3-22
3.5 HEEL ANGLE/LEEWAY CALIBRATION
Calibration of Heel Angle and Leeway is only necessary if a Heel Angle
Sensor is fitted to the yacht. The fitting of this sensor is highly recommended
because it allows the calculation of Leeway and hence course corrected for
Leeway which is used in the calculation of Dead Reckoning.
3.5.1
Heel Angle Calibration
The Heel Angle Sensor should be mounted as upright as possible, to read
zero when the boat is upright. However any error can be removed by means
of Heel Angle Calibration.
The heel angle should be recorded by a visual check from astern, on a calm
day with the boat lying on slack warps in the dock, head to wind, all the gear
stowed in its normal place, and anyone onboard standing on the centreline.
Under these conditions it should be zero, any error can be taken out by the
Heel Angle Calibration by adding, or subtracting, the error from the existing
calibration.
Heel Angle Calibration is to be found in the system menu under:
PERFORM
→ → HEEL, CALBRATE → → CAL VAL1
3.5.2 Leeway Calibration
Calibrating Leeway is difficult and it may be more accurate to consult the
designer for the vessel’s theoretical figure. In the absence of a figure a
calculation of Leeway Coefficient can be made using the following formula:
L = K x H
Bs x Bs
where: Bs = Boat Speed
K = Leeway Coefficient
H = Heel Angle
L = Leeway Angle
K the constant that needs to be entered. To establish a value for leeway
coefficient it is necessary to measure the leeway angle at a particular heel
angle and boat speed. One method for this is shown In Fig 3.3 - Leeway
Angle Measurement.