Talking about nav. with map and compass, some years ago I set off hiking somewhere in Canada (Mount Washington on Vancouver Island I think it was). I took a photograph of the trail map at the trailhead and set off. Obviously, as it was new terrain to me, I kept a close look at map and compass in the early stages of the hike. But the terrain, covered in snow at the time so no obvious trail to follow, really didn't match the map and compass, and got worse. I checked and double checked. Eventually I zoomed in on the map photo only to find out that the map had not been oriented North-up on the noticeboard at the trailhead. Duh! Problem solved! Back on "track" in just a few minutes...