Workoutdoors is the App for anything like that. So maps and elevation gain and any other stats you want. Battery life (with the S6) seems pretty good, but I am not sure if I would use any workout app (like WOD or strava) for 6+ hours; so for any long trip I would just use the watch. So depends how long you ski for. The S6 always on elevation and altimeter may be all you need for showing the climb on the skin up.