Seth K.wrote a review of National Geographic Maps: Trails Illustrated Rocky Mountain Range Maps on March 5, 2012
I got one of these for a trip to The Maze at Canyonlands and it was perfect. I seriously would not recommend going without one.
using a map tool that matched the scale, I was able to get some surprisingly accurate coordinates for my gps.
The material/paper feels pretty sturdy. It was everything a map could be.