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Open water swimming - inaccurate pace and stroke counts?

Former Member
Former Member
I used my new forerunner 910xt in the ocean for the first time over a course that I already know the distance of. It got the distance right and the average pace about right (3kmh) but shows a maximum pace of 26kmh!! Now I am good, but not that good! It also shows an average stroke count of 29/min and a maximum of 89/min!! I wish. I did not alter my pace or stroke throughout, so why are these things so wildly wrong?