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I'm doing the Guernsey Marathon in August.
Battery life on my FR10 seems to be topping out at around 5 hours, but declining slowly all the time. As 5 hours is roughly where I am in terms of marathon time, I've upgraded to the FR620 (thanks to the Sportsshoes code posted elsewhere!).
Question on mobile data for Guernsey, as I like the idea of activating live tracking so my wife can keep an eye on my progress. I see that data is treated as Europe as far as O2 is concerned.
Question is, assuming I close every other application and have the bare minimum sending and receiving data, what sort of usage will I rack up during a 5 hour marathon where the tracking feature is active?