Gps-speedsurfing

Hello

I have just had a session today where I had a few runs where the GW-60 was giving 10 sec runs over over 31 knots and a peak speed of 35ish.  Looking at the averages from the display I should have an average of over  30 knots but the upload is giving an average  of 4 knots less missing all  of  the better runs out. I have tried uploading the trackpoints to GPS results and that is giving the max speeds but  no 10 seconds runs. Can I send anything to someone for some help as I have no idea what is going on.

Thanks

Adam

KATER