>> On the other hand, while driving home, the monitor did briefly flash up
>> 206 BPM,
> 
> ANything can interferes with the signal between the chest strap and the 
> watch can cause problems.  If I cycle under power cables, or near an 
> electrified railway track it screws up.  Cars are notorious for 
> electrical interference, so I wouldn't believe anything it says whilst 
> in a car.

Last night, I drove to my dance class, and I drove home again. And on 
both journeys, the monitor went crazy just as I drove past a specific 
roundabout. I have no idea why, but that seems like one hell of a 
coincidence...

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