"In addition to using the map and compass together I strongly recommend folks learn to use the map and compass along with their GPS. know how to find the current magnetic declination, etc."

I agree completely with this. One additional skill - learn and use indicators in the night sky, like the North Star, Orion's Belt,etc. They are constant, and are not affected by ore deposits and other sources of local variation. Hopefully there won't be too many clouds.....

The more arrows in your quiver, the better off you are.