I have noticed that when i use latest version of GPSresults there is a limit of 1,5kn maximum speed error but in earlier versions the limit seems to be higher. If you set a record or personal best i guess its no problem because the rtk will check files but when compeating with friends etc you might have some higher 10s (with errors over 1,5kn)  if you use older versions of GPSresults. How is it with GPS Action Replay and Real Speed? I cant find anything under basic rules that you have to use latest software? I didnt know this until i noticed that myself in Karpathos. Just info that this can happen. Cheers Björn