Hi,
I have a problem with the gps of my GARMIN FENIX. Sometimes, one point is totally out of the race and then the distance is completely wrong.
On a ultra trail of 120 kilometers, my garmin fenix registred 140 km. 2 more or 2 less is possible but not Twenty.
To understand the problem let's zoom on the following link (triathlon Gerardmer) http://connect.garmin.com/activity/373054112
Zoom on the lake per example and see what happen sometimes. It was, supposely , a straight line , i was not turning around in the water. ;):D
I changed manually on garmin connect the distance... the reason is quiet exact. ;-)
Thanks
Guillaume