For me taking a fix (marking a waypoint) at the truck when I start is a given. Then I take additional waypoints as I travel -- waypoints are free. Marking significant geographical features is a good habit because then you can literally draw a map on a featureless non-mapping GPS. Much easier to stay found. If on the other hand you are out skiing and don't bother to take care of basic backwoods navigation. . . 2 minutes with a GPS can spare you a lot of time stamping S O S in the snow.