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RE: Lunchtime Run: Cross country
For Heart-rate monitoring; I usually use a chest-strap device like this guy from Polar. I think I recall reading somewhere that these have a better accuracy than the optical / wrist-based sensors.
You can usually get Bluetooth or ANT+ versions. Some phones have ANT+ capabilities, but you'd likely have to pair those with a GPS ANT+ watch.
I have seen some that say they work with Endomondo for about £25. I may invest in one.
I'd recommend it. I think I got mine used for about $50 CAD.. was fine after a good scrub to get all the stranger-salt out of it.