B&G H2000 Pilot *DISCONTINUED* - Manual (Page 83)

HB-0845-06 83
Without these basic inputs you cannot have the more
important values of true wind speed and direction and
velocity made good, which are calculated from them. As an
absolute minimum your system should measure these four
parameters. There are many really useful additional values
that the h2000 allows you to measure, but they are not
essential to the system's primary function. Nevertheless,
these will need to be calibrated as well, but we shall deal
with them separately, after we have the main system up and
running.
On any yacht after the launch, the calibration of the sensors
should have the same priority as making sure that the sails
fit. It is crucial to keep a full record of the process.
Appendix 1 contains calibration tables for this purpose.
3.2 BOAT SPEED/LOG CALIBRATION
3.2.1 Principle of Log Calibration
To calibrate the log we must work out the number of
revolutions of a paddle-wheel, or sonic pulses per second
that correspond to each knot of boat speed. The boat
speed/log calibration value is always shown as Hertz per
knot (Hz/Kt)
The h2000 allows for calibration of separate port and
starboard sensors, as well as a single unit.
There are occasions when you will need to calibrate each
tack separately e.g. for dual or single sensor installations,
due to the placement of the units off the centre line. If you
have a single unit which you have calibrated automatically,
as we are about to explain, and it shows differences between
one tack and the other, then the solution lies in using the
manual method of entering percentage offset values into the
Boat Speed correction table.