I do quite a bit of back country navigation for work. On foot, snowmachine, or 120 knots in a helicopter. We have quite a few cool toys in inventory, ranging from the pedestrian Garmin GPS to some very expensive survey grade Leica GPS and from a basic iPad with mapping apps, to a high dollar field tablet with GIS capability.
We always carry a hard copy topo map. Much more practical big picture planning than the tiny GPS screen and a lot lighter and more reliable than a tablet.
I haven't carried an actual USGS issued map in years though. Not even sure I own one anymore. Usually print USGS digital topo on waterproof paper from one of the various software programs, or even just Google Earth using the USGS topo overlay. I will usually overlay every cabin, camp, trail, and airstrip I'm aware off on the map before printing, as well as proposed travel routes when I'm going into new country. I might print off some air or sat imagery too, but the usefulness of that varies quite a bit based on resolution, terrain, and scale.
Yk