I recommend Google Maps for getting position on a map if your GPS is working (boring answer I know). Also, I prefer the native compass over a few other compass apps I've tried.
Google Maps on the iPhone is great, if you have data connectivity. If you don't, it's worthless, as it does not cache map data. Make sure to have an app that caches map data and cache the data for your AO.
It might be good to carry around at least the cord part of the charger. Keep the lighter portion in your car if you don't feel like lugging that around. If you can find a USB port somewhere (probably your car) and you're stranded, then you can at least charge up and most likely maintain the ability to send/receive text.
Good advice. I also carry a LiOn battery to charge my iPhone and/or iPad. I don't use it often but when I need it, it's a (figurative!) life-saver. A small external battery may make sense when off the beaten path.
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