Originally Posted by
gregf83
Unfortunately, speed can't change instantaneously. If you were going 60mph you should see multiple seconds at a similar speed. If you don't then it's just a glitch in the GPS. I didn't see any samples even close to 60 so I'd chalk it up as a glitch.
I think your "glitch" analysis is not so good.
If you look at the speed data and elevation profile, you'll see speed increasing up until 2:36.04, then flatlining at 32mph for about 5 secs (until 2:36.09), despite elevation clearly indicating a steep decline.
Clearly the glitch was a dropout leading up to the top speed, which by the way was recorded consistently for 3 seconds as being near the 60mph peak.