Originally Posted by JeanneP
What do you mean by the "polar for the boat"?
Its a graph of wind direction to the bow against speed.... it shows you the optimum speed it various wind conditions.
Some GPS systems that are linked to the wind instruments will produce this data. Otherwise it is a manual job and it takes time.
The weather software is able to use this information to work out the optimum direction for the conditions.
The round the world racers use this sort of system to get in to the weather fronts and keep the boat moving fast.