Some navigation apps are very taxing on the battery of a device. It really depends on what the app is doing. On an iPhone, just using the GPS chip information really does not cause a major hit on the battery, but using something like Google Maps really does. Plugging up is certainly doable as long as you have a USB port on the bike.
If you use something like Motion-X GPS on the phone and download the maps you'll need before you leave, that is much less taxing on the battery. Another trick is to turn the screen brightness down as low as you reasonably can.
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