polar f11 wrist watch- at times the watch isn't showing heart rate, it shows 00 at different times through out my workout.I'm having the exact same problem, and without the heart rate, nothing else gets calculated (zone, calories, etc.). Am wondering if it is a battery issue with the chest monitor. I've also read that you shouldn't play with the buttons when the watch is under water -- which I probably have done, since I use it for swimming.
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