For what its worth our GPS sorta F-ed us.
I have the Garmin nuvi 660 (msrp of about $850).
On my first run it was my intent to go a tick past 150 for licensing. I put 156(ish) on the GPS and held it steady through the 3rd. The timing slip read 149.85, this meant that I could not run past 175 on my second run and had to re-run for the license.
On the next runs it read hot every run
On my pops last run of 169.745 was showing this on the MAX speed of the GPS (and he lifted because he was already running faster then what was allowed for his license according to the GPS).
Now next year I have to make another license run between 175-200 before I can even make a run for the record @ 205.
As you may guess I am a bit bitter about being screwed by the GPS. I still dont know why it would of read hotter than the timed speed (I could see it running less if it didnt refresh quickly enough) but it only means that it didnt roll the same numbers and by proxy I was screwed.
Anyway this is my angry GPS story, I will know better next time.
-JH