Originally Posted by
01 CAt Man Do
While the phone's battery is limited ( usually 3-4 hours of navigation ) I can easily extend the range by charging the phone with an external battery. Since I usually carry a battery powered bike light on my rides ( day or night ) this is not too hard ( or too expensive ) to do. The hardest issue you might deal with is finding a way to mount the phone to the bike that meets your needs. All said, it is an option worth consideration.
Lots of people use smartphones instead. It's definitely worth considering.
If you use a smartphone (and ride long distances) to have to consider doing something to make it weather resistant too. (Recharging it while riding is probably something you don't want to do in the rain).