I used to use ScoutLook. It was a good app to use when i was putting out trail cameras. Over the last two years I have acquired over 35 of them. The app really helped when i had to go back and retrieve them all because there were plenty of times where I i left the woods with 32 cameras and i couldn't recall exactly where the last 4 or 5 were. But as far as safety goes. Like these gents are telling you, an electronic device is not nearly as reliable as a compass and familiarity with your surroundings.