Map download app

[OakLeaf]

Yep. My phone, and the phone I had before that, were good for five hours from unplug to dead with the GPS on. That's *without* keeping the screen lit so as to use it for navigation. Now, I'm told iPhones have better battery life than HTC phones, but still I would strongly suggest a higher-capacity solar recharger and/or battery pack that can be used while riding, either from a handlebar mount or a long cable to the rear rack.

Traveling in and out of areas with low or no cell coverage will drain the battery really fast too, GPS or no. That's something a lot of people overlook.