Question for you guys, especially travelers like me do you prefer GPS or printable maps? I don't know but from my latest trip, GPS wasn't much of help. I had to resort to pdf maps from this site http://vectormap.info/ which have been very useful.
I always bring a GPS and two paper maps: one in my mapcase around my neck, and a backup map in my rucksack, in case I lose my mapcase including map. The screen on a GPS receiver is far too small for wilderness navigation, it relies on batteries and on coverage (can be problematic in narrow canyons). If I had to choose one I would certainly take only the paper map. A paper map always works.
Of course, the importance of either depends on where you are hiking. I usually hike off-trail and navigate based on streams, lakes, and mountains. The GPS is mostly a toy, but can save a lot of time in dense fog. When you're hiking on well-signposted trails in an American state park or in the vicinity of Swiss towns such as Zermatt and Grindelwald, you don't really need either a GPS or a map. I still take both (although in this case just one copy of the map), but I'm a topographic map nerd who takes one even when it's essentially useless.