I am  new to movescount, however it is really easy to use and there is no third party software needed. That made me try this website, it has a lot of users, even a lot of windsurfers!! To make an account just register, it is quite easy.

If you want your results from your watch online:

1.  download this software: http://www.movescount.com/connect/moveslink/Suunto_Ambit
2. make sure you have internet connection
3. do an exercise (make sure you press start to start an exercise)
4. connect watch to pc with USB
5. go to movescount.com and check my moves.

just speed...
For speedsurfing the gps-speedsurfing.com website is the place if you want to go as fast as possible. If you like to race together with your surfmates, better check gpsteamchallenge.com.au.

GPS-crossing.com
The gps-speedsurfing crew also made another website which can check crossings. You do need third party software to read the gps data and there are not a lot of active users here.