Get bored with books and I have cribbage, hearts, spades and a few other game apps. Or I can take pictures of the inside of my tent, I guess. Record myself snoring... write a novel in Quickoffice...
Thank you AlmostThere, too funny.
I had chimed in because I'm really device free. I'm pre-GPS Army topo trained and tested (then it was PLGR/SLGR - ah the 4 lb. Slugger) so historically I've just followed the primary tenets of land nav. i.e. situational awareness. Have your map, know where you're at, know where you're going, know what you're capable of, watch the weather, know and be able to identify major and minor terrain features, intersection, resection, understand magnetic declination, and don't put yourself in any comprimising positions.
I've been trying to make the jump but just as I bought my first deeply discounted GPS last year I realized quickly that it was the new full retail value model (not what I got) that allowed custom loaded maps. Harrison Maps are my standard and really where I've been trying to get to is a device where I can easily see an icon on a digital copy of a Harrison map. I took the GPS back. Even with the newer one GPSMAP 62 series I could "load" it and line it up but that would of course require a then-unavailable didital copy of a harrison map. USGS 7.5 are readily available but often I don't like them and I'd have to string a bunch of them together.
I can't plan w/o a real map so liklihood of not having one on the trail is almost none. However, of all the places in the world to go soft copy late Summer in the Sierras is probably it. It's pretty dry, it's long but relatively narrow so there are lots of bail outs, it's pretty populated in August, etc.
I just don't know if we're quite at the point of "my phone is as reliable, as useable, and as indestructible as my GPS". I think we're really close though and there are certainly those who go with just a GPS. Even after we get there though it takes a while for adoption to take place. I had a Thomas Guide in my trunk until 2005 and they unoficially went out of business in '99 when they sold to RandMcNally.