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2017-05-30 08:46 pm (UTC)
It's probably a combination of failure to run tangents (I see the course makes a lot of turns) and GPS errors, which are partly due to the phone chip and partly due to satellite uncertainty. Are there a lot of big buildings on the route? That can add to the misreadings from the GPS.
I just did a
search on Strava
which came up with a bunch of hits for Green Bay half marathon (over several years) and you can see that the apparent distance ranges from 13.0 (!) to 13.8 (not counting a 20.6 which looks like the guy forgot to turn off his Garmin when he got in his car to leave!). Yours is pretty far off, but not ridiculously (except for the last 1.1, which seems awful).
I don't know how old your iPhone is, but I can tell you that when I went from the Garmin 301 to the 305, and from the 305 to the 610, my race distances got closer to nominal. A fairly straight half with the oldest watch came in at 13.34, same one with the newest was 13.17. So it does make a difference.
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