B&G H2000 Pilot *DISCONTINUED* - Manual (Page 102)

h2000 User Manual
102 HB-0845-06
Finally, the most important thing is to record all these
entries in the Calibration Charts provided in Appendix 1.
3.4.2 True Wind Speed
The True Wind Speed suffers from another, mainly
aerodynamic, problem, where it tends to over-read
downwind because of acceleration of the airflow over the
top of the mast. It is possible to correct for this by applying
a downwind correction to the true wind speed. This
correction is applied at 165 degrees in a Hydra system, or at
the user set angle in a *Hercules system, and linearly
interpolated to zero correction at 90 degrees true wind
angle. The routine here is to bear away quickly from close-
hauled to your usual downwind True Wind Angle and watch
the increase in true wind speed. Then the difference is
entered as the negative correction. The table will look
similar to the one shown in Table 5 - True Wind Speed
Correction.
Wind Angle True Wind Speed
5 10 15 20 25 30
Correction (kt) 0 0 0 0 0 0
Correction angle* 165 165 165 165 165 165
Table 5. - 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. It is crucial to keep a full record of the process.