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A few weeks back someone posted a really useful thread (from a couple of years back I seem to recall), about the best way of accurately keeping track of your marathon splits by manually pressing 'lap' on your Garmin at each mile marker instead of relying on Autolap.
Can I find that thread now . . . . . . .
Please can somebody point me in the right direction . . . . thanks.
Hope everyone's as fit and well as possible and looking forward to Sunday as much as me. Good luck all!