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Sunday - 5.46 miles.  Nike+ mileage = 5.33

Monday - 4.47.  Nike + mileage = 4.56

It seems reasonably close now....

Well...  I ran my usual route, 4.47 miles in 37. something mins and then 'Calibrated' the iPOD Nike+ thingy (as it suggested I had only run 3.3 miles).

I have had another run on the same course and... the thing told me I had run 4.49 miles.  I'll try again tomorrow to confirm it wasn't a fluke.

Thanks all!

As I run the same route through the winter (three or four days a week anyway). I will try the calibrate button after my next run and make the thing believe it has run 4.47 miles to see if that improves the readings.

I shall post back the results.

I am using my Nike + sensor in a pair of Nike Pegasus+ trainers that I have just bought with a nano 7th Gen.

I tried to calculate the distance of my daily run using a few map sites and they all say 4.41 to 4.47 miles. The first run with nike plus said 3.84 the second said 4.04 (I had not calibrated it).

Anyway, I looked at a 1/2 mile route using map my run and then tried to calibrate the sensor. I ran the route until the voiceover told me that calibration was complete and it appeared as if I had run over 50 yards more than suggested by the end point on the map. On a plus, the trainers are very comfy.....

Does anyone have any ideas? What do I believe, the map or the nike+???

Out at 0500 this morning; 3 miles just taking it easy