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Ooh. Is it accurate at all?
https://support.garmin.com/en-GB/?faq=kbOXNev7NS4DQcc3IjAV49
I see it was a recent firmware update that enabled it. I must remember to try it out on my 945 when I next go to the pool. I'll use my OH1+ too and try and remember to compare the results.
(Local pool not opening for another couple of weeks though.)
Greenbank
Sainsburys_Ed
not actually correct any more, my fenix 6x does wrist based HR...