Thanks, Scott. The Scenic Map web page is here
http://scenicmap.blogspot.com/
They're offering a free map of the southwest/Grand Canyon region to introduce the application.
The area covered starts in Phoenix to the south. Montecello UT is the northern
edge of the free map, so not quite all the way to Moab.
You pay $10 for a 2 GB map of western or central or eastern USA, or Alaska.
The web site has a couple of YouTube videos that show how the program works.
Scenic Map can work with GPS input so you can see where you are in real time. There's
a web page that describes how to use Scenic Map with the iPad 3G, which has a built-in GPS,
and with external GPS units that can link to the iPad via Bluetooth.
http://scenicmap.blogspot.com/p/compatible-gps-receivers.html