B&G Hydra 2000, User Manual

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Hydra 2000 User Manual
Part 3 - Calibration
HB-0844-02
3-22
correct for this by applying a downwind correction to the True
Wind Speed. This correction is applied at 180° true wind angle
and then linearly interpolated to zero at 90° true wind angle. Bear
away quickly from close-hauled to dead downwind and watch the
increase in true wind speed. Then the difference is entered as a
negative correction. The table will look similar to Table 3.2.
Wind Angle True Wind Speed
5 10 15 20 25 30
Downwind 180 0 -0.5 -1.0 -1.5 -2.0 -2.5
Table 3.2 - Example of True Wind Speed Correction Table
The corrections are found in the menu under:
WIND
→ →
TRUE W/S , CALBRATE
→ →
CORRECTION
They are entered in the same way as the true wind direction
corrections. Remember to enter the values on your correction
chart in Appendix 1.
3.7 DEPTH CALIBRATION
A typical transducer installation is through the hull at a suitable
position between the water line and the bottom of the keel. A
DATUM (offset value) can be set, such that the depth display
refers to either the water line or the keel line.
Fig 3.7 - Depth Datum