What US atlas program should my friend install on his iPhone (to use with my old GPS receiver)?

My friend and I are taking a camping trip to the lower Appalachian Mountains (parts of NC, SC, GA & TN). He has a new iPhone. It can store and display gobs of information, but it can’t connect to Google Maps (or whatever brand of map app Apple settled on) unless he gets cell reception – an iffy proposition where we are going.

Meanwhile I have an old, primitive handheld GPS receiver (a Magellan Blazer12) that gets it’s signals from the satellites up in heaven. Still, it can only tell me my longitude, my latitude, and which way is north. The b/w lcd display screen is purely alphanumeric; there are no graphics whatsoever. If the Grand Canyon was over the next hill, it would not be able to know or tell me.

Now, I figure that if my pal installs some type of US atlas program into his iPod, we could make a winning combination. I would tell him our coordinates, he would plug them into his phone, and boom – we’d know where we are and what’s around us!

Assuming there is no flaw in my logic, what atlas program should my friend get?

Thanks all, in advance.

Re

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I think this is 100% wrong. Must smartphones have GPS antennas and functionality built in

See iPhone 5 and Satellite GPS - Apple Community

MotionX GPS can download public maps ahead of time such that even without a cell signal and without a data plan, you can still use the maps. It will also use the GPS inside the phone to try and find itself on the maps.
Disclaimers:

  1. Using an iPhone as a GPS is going to give you about 2 hours of battery life. You are doing the two most energy intensive things on the phone- searching for GPS signals and running a full screen calculation of the map at the same time.
    a. I would only recommend this as a backup solution. Even using the iPhone to take a picture is going to kill your battery faster than you can imagine.
    b. I’m not joking about only using it as a backup- unless this is plugged into a car dash don’t do it.

  2. The program costs a couple of well spent dollars.

  3. The old GPS is worthless unless you set a starting point and just want to find your way back to that point.

This is wrong. I often use my iPhone as a GPS on full-day bike rides. As long as you don’t have the screen on all the time you can easily get 8 hours’ use out of it, and that’s if you’re keeping a tracklog. If you just want to fire it up every so often to find out where you are, then you can get much more.

I use an app called ViewRanger and highly recommend it. You can download proper topo maps (in tile format so you only pay for the areas you want), or use free mapping off the web. You don’t need a mobile signal to use the maps because they are stored on the phone (automatically for the topo maps; if you want to use the free maps then you just save them onto the phone before you leave cell range).

The app plus maps for all my usual cycling areas cost me about £30, and it beats the hell out of the dedicated mapping GPS my friend bought three or four years ago for £350. The GPS track always seems very accurate - when I record a track and later overlay it on Google Maps etc, it perfectly follows the trails I took. This is on an iPhone 4.