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* Most touchscreens do not work well with gloves, in the rain, or with sweaty hands.
* Few smartphones are waterproof, so a specialist case will be required to protect it. (See caveats below regarding cases and GPS Accuracy.)
* The battery life of a smartphone can be an issue. I've found that typically a fully charged phone will only last around 4 hours with the screen active.
=Heart Rate Monitors for Smartphones=
There are a number of options for adding heart rate monitoring to a smartphone.