Originally Posted by Rolf_Nilsen
I think the whole idea is to have a little fun with this, not taking it too seriously smile
According to the webpage speed is average speed measured over 10 seconds. I guess the speedpuck have this functionality.

You get the 10 sec avg by importing the GPS data into software, thats the same thing that speedsurfers use.
Here a list of apps to do it with: http://www.gps-speedsurfing.com/default.aspx?mnu=item&item=GPSsoftware