Hi,
Just want to share this with the group. For the ones not afraid of using alien technologies. I was using this (
http://topomapsapp.com/ app on my iphone to track our location during the mohave road trip. It works w/o Cell service, prior to your trip, just download the maps in the area and you are set to go. I didn't want to post it up until I had a chance to test it out this weekend, but it's well worth the 7.99 in the app store. Once you get the app, the maps are free.
I know not everyone use Apple product, but I am sure there are similar apps available for Android device.
Spencer