I race in the same area which is influenced by tides and back eddies. Also different at springs and neaps. I want a method of recording the tidal speed when racing on a log - say every 1 minute preferably using a smart phone with compass and GPS - If not then a custom instrument.
I want take the data at the end of a sail and create an hourly tidal chart.
Any ideas? Any ideas of another forum which could help?