I did...
a windy, heavy tree covered and hilly track I often run is measured to be 3,33km. During winter time a 3x lap = 10k race is held there.
I ran there with a fr 305, fr910, f3 and f5x... they where always short (fr305 beeing the closesest one) - from 200 to 500m per lap. I was not very worreid as there are really some demanding gps conditions.
2 or 3 weeks ago I went there with stryd. Did 6 lap and stryd clocked 20,01km. It was set to speed and distance ALWAYS of course.
