I wouldn't trust to landmarks for any forested area. Around here people get lost in the woods all the time...usually the ones who don't have a compass or GPS. You can walk a LONG time and never see power lines, cut line, trail, road, etc in Alberta. If you're disoriented it's even worse. I've heard of people getting lost within a km of their truck or ATV and wandering for hours going in circles.

At least with a button compass you'll keep walking in the same direction.