The heart rate monitor almost never works the same way twice. Sometimes if you turn the watch off and then turn it on and then start it up and wait for it to stop blinking, it's accurate. Other times it starts at 155 even though my heart rate is 60. Other times it starts very high and then eventually kicks in after the first 10-12 minutes. Since I really only want the lap time and heart rate at the end of the lap, that's not good. GPS works well, quite adequately. Wouldn't buy again. It was a replacement for the first order that didn't work at all.
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