I also like hunting alone. I do not have a GPS but do carry a bic lighter in case I have an overnight stay in the woods. I fire could make the difference. Like Joel said carrying the cell phone in your pocket is key if you are in a tree stand. If you should fall then the cell phone is useless 15-20 ft away from you. Leaving a map as to your whereabouts is also key. Think safety,safety,safety and you should be all set. Don't worry about a deer charging you as they are not considered dangerous game. All animals in the woods are much more afraid of you. Hunting dangerous game requires a backup plan. I would not recommend grizzley,brown bear,elephant or cape buffalo hunting alone.