This unit download directly to GPSactionreplay. You can then upload data to www.GPS-speedsurfing.com. Please note, this unit is only currently compatible for WINDOWS OS and not MAC, sorry.
GPS SPEEDSAILING WINDSURF with your GPS : If you want to join the growing trend of GPS speedsailing windsurfers, then the new VELOCITEK S10 GPS is the perfect partner. It is water resistant with no "entry points" like USB sockets etc so water ingress will not occur. It can sample down to 1 second sample rate, something that makes it popular for GPS speed sailing on sites like www.gps-speedsurfing.com. There are no external buttons so it is impossible to miss that fastest run.
http://www.gps-speed.co.uk/gps-speed-windsurf.html