thalia: woman running, caption "Thalia" (running)
Thalia ([personal profile] thalia) wrote in [community profile] runners2017-05-30 12:38 pm


Last weekend [personal profile] meri_oddities and I ran the Green Bay half marathon, and it was really fun. Very well-organized race. I was totally untrained, though, so we're not talking about my time.

I was using my iPhone for race tracking, and it says I ran 14.26 miles, rather than the expected 13.1. What I'm trying to figure out is, is it possible that my tangents are that horrible, or is the phone probably wrong? I've never had reason to think its distance is inaccurate before; I use it all the time running at home, and its distances have always been more or less the same as what I'd get from my Garmin on my regular routes. But, wow, that's a big difference.

Here's the mile-by-mile breakdown. I missed the first mile marker, so the first lap covers the first two miles.
Mile Marker Race Distance GPS Distance
2 2 2.08
3 1 1.03
4 1 1.03
5 1 1.11
6 1 1.13
7 1 1.1
8 1 1.09
9 1 1.05
10 1 1.04
11 1 1.07
12 1 1.08
13.1 1.1 1.45
Total 13.1 14.26

That last lap included a foray into Lambeau Field, and I stopped a few times for photos, so I'm not surprised it's on the long side. Most of the other laps aren't too awful, except for miles 5 and 6.

What do you think? Do I just need to learn to run better routes? Are my phone's numbers completely unlikely? Help!!!
linaelyn: (exercise running by dropsofsunshine)

[personal profile] linaelyn 2017-05-31 05:39 am (UTC)(link)
Tunnels do indeed play havoc with iPhone GPS, as evidenced by my ability to spin Pokéstops (in Pokémon Go) that are up to a mile away, while driving through tunnels. (ONLY when I'm a passenger!)

As much as I'd LIKE (as an Apple Spouse, whose bread & butter comes from the company) to say the GPS on the iPhone is every bit as good as a Garmin... um... yeah. Not so much. Wearing a (2nd generation! yes, it matters) Apple Watch and ALSO using the iPhone on one's person, definitely improves the odds for being geolocated accurately.

Distance is one of the things that Apple is still working to get right. But, at least there was a recent study that showed they are best in the class, for caloric burn data and heart rate monitoring? I have a friend who had her fFitBit tell her she had a serious heart issue, and careful doctor's monitoring showed nothing. Dr.'s prescription was to borrow an apple watch for a month and see if the problem reappeared. It didn't, so she was declared the victim of tech glitch in the FitBit. :-}
linaelyn: (hugs from kittens)

[personal profile] linaelyn 2017-05-31 05:43 am (UTC)(link)
Additionally, GO YOU!!! I want to try a couple of half-marathons around here, or at least some 10k races, before summer is over. But... I haven't been training, trying to totally heal up that plantar fasciitis. I'm walking 10 miles a day right now, and running maybe 5K on a regular basis. It's nice to see you are not afraid of running a race when you haven't trained! Well done!!! <3