B&G Hydra 2000, Руководство пользователя

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Hydra 2000 User Manual
Part 2 - Operating Information
HB-0844-02
2- 30
Heel Angle is a useful option that improves the accuracy of some
of the calculated functions. Heel can be used to give some idea of
the wind pressure when abnormal shear or gradient is affecting
the True Wind Speed. It can also be checked when going upwind
to ensure that the boat is not sailed over its optimum heel angle.
2.11.21 Leeway
Menu Heading: NAVIGATE
Function Text: LEEWAY
Update Rate: Once per second
Units: Degrees
Note
Requires clinometer for heel.
Leeway is the angle between the boats heading and its course
through the water. The difference is caused by the sideways slip
that the boat has when going upwind. For the Hydra to be able to
measure this it needs to know the heel angle, and hence a
clinometer must be fitted. Leeway is of great importance in the
calculation of Dead Reckoning, since leeway can considerably
affect the dead reckoned position.
2.11.22 Layline Distance
Menu Heading: PERFORM
Function Text: LAYLINE
Update Rate: Provided by position fixer
Units: Nautical miles
Note
Requires NMEA 0183 interfaced position fixing system
transmitting the ZDL sentence.
If tacking upwind or downwind to a waypoint, this function displays
the distance of both left and right-hand laylines by alternating the
display between the two. An L or an R is shown in the right-hand
digits to signify Left or Right laylines respectively. This function is
useful when nearing a waypoint. When the value reaches zero, it is
time to tack or gybe for the mark. The calculation should be
corrected for any tidal offset.