SDK--like Wavehog, you'll have fun getting your paddling mates to estimate the wind speed, then sharing your own anemometer readings with them. I paddle often with a former small-boat sailor and I now and then get him to estimate, usually at the end of a day's trip while we're standing on the shoreline at water's edge, and the wind is up. He'll say "20 knots"; I then show him the anemometer and it's maybe 11 knots. He's getting better.