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Most smartphones have a GPS built in and support various applications that allow them to function as sports watches. These phones can have remarkable levels of [[GPS Accuracy]] as well as many other advantages.
=Watches for Ultrarunning=
[[File:ChargingOnTheRun.jpg|right|thumb|200px|Charging a watch on the run can work, but it's awkward at best.]]
Choosing a watch for an ultramarathon requires some tradeoffs and there's no simple answer. The main factor is battery life, and some runners will want navigation.
==Battery Life==