Is my iPhone 5 GPS measuring my runs wrong?

I had an awesome run with Neill ( @BigBigGeek ) yesterday around the same lake as a couple of weeks ago.

I don’t generally trail run because there aren’t any trails near me to run, but I really enjoyed getting on a surface that wasn’t asphalt.  Up and down hills, around roots, over rocks, it was great.  It is also fun to be able to run with Neill.  He and I have a lot in common as he works for Dell and I buy from Dell. 🙂

One thing that bothered me though was the way my iPhone 5 measured the distance.  By the time we finished Neill’s Nike watch said we had run 5 miles under a 12 minute pace.  My iPhone said we ran 4.58 miles at 13:11 pace.  This really made me think.  Last weekend on my long run I was running with my iPhone in a belt and though I should have been able to keep up with the goal pace I set, it was like I was behind the whole way.  I ended my 13 mile run having to run 1/2 mile further than I thought I had too.

I guess it is better to have my phone measure me as going slower and less distance than I actually ran since in a race the distance and time are correct, but it is frustrating that I might be running a minute a mile faster than I think and not know it.

Maybe a Nike+ Sportwatch is in my near future.

Not much more to report today.  I am a bit behind since I didn’t get to this last night.  I hope everyone has a great weekend.

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