Just register and your fastest 5 ten second runs will count. Yoo can win some great prizes not just by winning but just entering so you've got nothing to loose.
Oooh, interesting. I have a handheld GPS and a variety of different aquapac cases so that would be interesting to try. Not from a competitive point of view (getting in the straps is an achievement for me at the mo) but as a personal goal type thing.