38 47_processor_Regatta_um_UK_40
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Tangent point to polar
VMG = boat speed Xcosine (True Wind Angle)
• CMG :
Stands for Course Made Good.
It is the speed towards the mark.
.
Upwind and downwind it is not very relevant, while sailing reaching it is a very
valuable data.
CMG = Boat speed * cosine (Heading - Marks
bearing)
• Target boat speed:
It is the theoretical best VMG. Useful information when sailing downwind or upwind.
For other conditions it is better to use the polar speed.
• Target true wind angle :
It is the optimum wind angle for a given wind speed. This angle gives the best VMG
• Polar speed :
This function is calculated from the polar table against the wind speed and wind
angle. It shows the optimum speed for the wind conditions.
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