Originally Posted by dbostedo
Fairly? With a good signal from multiple GPS satellites, and on a straight line, they can be very accurate. I've run mine in my car several times and it very much matches the speedometer (I might have reported on that earlier in this thread).
So it should be fairly accurate as long as it's got a good signal... though it's probably somewhat still prone to glitches, particularly in factoring in drops and tight turns on a mountain. I know at least one time when SkiTracks clocked me at over 30 MPH as I got off the lift at the top. And I'm pretty sure the lift doesn't eject you that fast.
Agree, GPS is going to be accurate most of the time. But the issue with a max speed calculation is that it needs consistent data ALL of the time for your entire trace. 1 glitchy datapoint is going to throw the max speed calculation out of whack since it's just calculating the change in position.
The GPS is going to have the hardest time skiing, as you're right on a rocky ice mountain, where there are reflected signals to throw off the gps. Additionally there's no secondary signals like multiple cell towers and wifi for it to help with the gps calculations.