I use an iPhone 4S with Viewranger. Amazing app. I bought the maps for the whole of NZ, all in 1:50,000. I've never had a problem with the GPS, in or out of cell reception. I just turn wifi off and turn 3G off etc when out of reception. Really extends battery life. Did a day trip using Viewranger from 7am until 10pm and battery was still at 70-80%. I've since bought one of those battery recharge packs so I could probably get 7-10 days out of it using it the same way.
With the app you can set markers and waypoints and add tons of information to them, as well as loads of other stuff I haven't used yet. I can't really see how a GPS could compete but maybe i'm missing something. Costs about 50 bucks all up for maps for the whole of NZ + the app. You also get a load of credits to buy individual tiles, etc, for other countries if you pay the $17 or whatever for the app instead of the cheaper version. It doesn't seem to have any for Australia yet which is a bit weird...but i'm sure only a matter of time.
And with the phone you have your ballistics apps, conversion apps, a camera, etc, etc. I even have a couple of videos on it showing me how to process deer for when I finally get one...hahaha.
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