B&G H5000 Analogue Expansion - Manual (Page 100)

100 | Operating variables | H5000 Operation Manual
Opposite tack - Target heading
Opposite Tack target heading displays the heading the yacht will follow on the opposite tack
using the target true wind angle.
Variable name (default)
Function name
Opp Targ
OPP TARG
Units ºM, ºT,
Alarms N/A
Calibration N/A
Damping N/A
Optimum wind angle
Optimum Wind Angle provides an alternative method of presenting Target TWA data, which
some people fi nd easier to use.
For every Target Boat Speed there is a wind angle at which that speed will be achieved (Target
TWA). The Optimum Wind Angle is the diff erence between this angle and that at which you
are presently sailing, so keeping the Optimum Wind Angle at zero achieves the Target TWA for
Target Boat Speed.
If you are sailing at the optimum wind angle then you will achieve optimum VMG up/
downwind for the current wind condition. Sometimes, particularly downwind, it is easier to
try to sail to a wind angle rather than to the Target True Wind Angle (TWA). The accuracy of
this function will depend on how accurate the polar tables are for your boat.
Variable name (default)
Function name
Optimum Wind Angle (OPT WA)
OPT TWA
Units Degrees
Alarms N/A
Calibration N/A
Damping N/A
Polar Boat Speed
Polar Boat Speed is the predicted achievable boat speed for the current wind conditions.
Unlike Target Boat Speed, which only applies whilst sailing upwind or downwind. Polar Boat
Speed applies at all wind angles; it is therefore useful when sailing on a free leg.
The helmsman and trimmers can use this fi gure as the target to achieve maximum
performance independent of any changes in the wind speed. The same data is also available
via the Polar Performance % function in terms of Boat Speed as a percentage of Polar Boat
Speed.
Variable name (default)
Function name
Polar Speed (POL)
POL SPD
Units Kt
Alarms N/A
Calibration N/A
Damping N/A