Stopwatch time: 1:27:30
Map distance: 4.33 miles
Distance: 4.07 miles
Per FitBit One:
Why the discrepancies? Well, the GPS is trying to track "active time", and I have no trouble believing that I lost 3:15 to stoplights and a couple of equipment issue stops (shoelaces and whatnot). The GPS also took an unusually long time to register satellites at the beginning, and I was wearing the device on my belt, so I have no trouble believing that it lost contact a few times. And history has shown that if the GPS loses contact at point A, and re-establishes it at point B, it concludes that you teleported the intervening distance. The GPS has been dead accurate when strapped to a boat over much longer distances.
The FitBit, on the other hand... I suppose that the 35% distance error isn't really too bad, given that it was calculated from an accelerometer that I wore around my neck. I would have liked better accuracy, but I can live with that. It does seem to be pretty consistent, though; Dementia and I compared FitBit stats from our trip to the zoo yesterday, and we were within a couple of percent of each other. The step count is weird, though; I can't imagine that it would be that far off, and I would expect it to be low, if anything. If that step count is correct, given the charted distance, I have a stride length of only 25.8 inches, which seems pretty improbable to me.
In other news, my heartrate immediately after finishing was 110, which is exactly where I wanted it to be.