You can select Stone sailing club on WindGuru, however that seems to differ from the BBC (I used Southminster ) about the only thing to do is look at as many sites as possible, work out the average, add 20 percent if your Mr Croote. Check all this against tide data, then throw the paper in the recycling because it's bound to be a load of horlicks. Prepare for the worst hope for the best, looking forward to seeing you all soon.