Lake swimming last night - felt a bit colder than last week but didn't affect my slow progress until I got back in the car and I couldn't feel my feet.
I wore my Garmin to find out how far each lap was - which was a waste of time because the data was all over the show (see below), it even stopped the timing at the opposite end to where I actually stopped. I can only assume it doesn't like the back and forward action of the arm and (I guess) there must be some reflective action on the GPS signal when it's under water. It thought I had stopped for about 20 minutes and although I'm slow I don't think I stopped other than to stop the watch.
It did measure my time in the water accurately though, so my estimate of 800m per lap seems about right for my pace.
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