Staunch traditionalist speaking up. GPS devices definitely have their place, and they are very helpful, f not essential, but the good old USGS 1:24,000 quad maps should be available for any serious enterprise - the paper versions, that is. Best if they are waterproofed and full size. That way you can slice off the blank margins for use as fire starter. Try that with your InReach!

You don't want to know how I learned this......