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ACCURACY OF GPS (205)
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I ran the Oxford Town and Gown yesterday, which apparently was an accurately measured course etc. My Garmin 205 managed to measure as 6.4 miles. Not only that I managed to average 6min/mile over the 6.4miles. My first 4 mile splits were 5.40, 5.43, 6.02, 6.02, which i find very unlikely. My actual finishing time of 38m36s gives an average of around 6m18s/mile, which is much more feasible. How is this possible? Can the GPS actually measure a mile 'long'?? Anybody else have similar? There is always going to be discrepiciencis in mile markers, but the above seems very odd.
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Also, in terms of 'long' miles, remember that an accurate course requires you to take the 'racing line': if you overtook people and/or crossed the road to go to a fluid station and/or got pushed wide on corners, etc. you will not have followed the racing line and may well have covered more than 6.2 miles.
I often find that my mileage on my regular 5 and a bit mile loop varies by 0.1 - 0.3 of a mile.