How long is a marathon?

Never used a GPS watch in a marathon before but used my all singing and dancing garmin for London. I know GPS isn't accurate enough as a measure - especially in a marathon with tunnels and flyovers like London has so I'm glad I was using their mile markers as a guide. I got 26.8 in the end. No idea how much was down to satellite signal and how much was me not staying on the racing line. What distances did you record?

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