Awesome thread here.
I live in Wyoming and hunt and hike this way often. Ill back up your thoughts on back country navigator app. Nothing, including my Garmin oregon, is as good as it is. Excellent at picking up a signal, very good for ensuring notes and waypoints, map and aerial choices are wonderful. I use it on my Samsung note 3 on airplane mode and carry a back up battery charger in case. I video (1080p), take pictures and read on it. All with no issues and plenty of battery. It's an amazing piece of kit.
Oh, and we got snow two days this week in the high country...