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Don't forget the effects of current. Around the Bay it's generally not too bad but can approach 3 knots in some areas. When you are tacking back and forth, it's good to know which tack the current effects you most, hopefully it's in your favor.
Edit: I think that there are too many variables to make any chart usable. It maybe OK for generalizations, but it would not be able to account for current, wind shifts, land breezes vs sea breeze, sea state, particulars of the boat (my boat always sails better on a Starboard tack than a port tack) etc....
Last edited by ehmanta; 05-04-2010 at 11:51 AM.