B&G Hydra 2000, User Manual

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Hydra 2000 User Manual
Part 3 - Calibration
HB-0844-02
3-3
PART 3 - CALIBRATION
3.1 INTRODUCTION
WARNING - Every care must be taken when undertaking any
Calibration Procedure to ensure that the Hydra 2000 System
is calibrated accurately and correctly. Incorrect calibration
could lead to incorrect navigational information.
Calibration of an integrated instrument system is probably one of
the most misunderstood, processes in the world of yachting.
Rather in the way that fast sails badly trimmed will add little or
nothing to the boat’s performance, racing instruments badly
calibrated, will also achieve very little. This part of the manual
removes some of the mystique and breaks the calibration process
down into a series of simple instructions. These instructions when
carefully undertaken in the right order will consistently produce
good results.
There are four basic inputs to your system that are fundamental to
its integrated approach - Boat Speed, Compass Heading,
Apparent Wind Angle and Apparent Wind Speed.
Without these four basic inputs, correctly calibrated, you cannot
have the more interesting values of true wind speed and direction,
and velocity made good, which are calculated from them. On any
yacht the calibration of these items should be as high on the job
list, after the launch, as making sure the sails fit. Finally, it is crucial
to keep a full record of the process. Appendix 1 contains
calibration tables designed specifically for recording your results.