GPS Speed Talker is a freeware Android App for Windsurfers that speaks out your speed while you are windsurfing.
It does not replace your Locosys GT-31, but it gives you a direct feetback of your current speed and lets you optimize your style and settings faster and more efficient!!

Ask me if you miss a feature!! i will implement it!

The App is for free downloadable in the Android Market. Just search for GPS Speed Talker.