When I got old, my wife started worrying about me hunting alone. I bought a Personal Locator Beacon. If you get in trouble, you open the antenna and push the button. It sends a signal to a satellite and NOAA relays your location to the nearest search and rescue team. It gives me a warm fuzzy feel when I'm miles from camp and wondering which way to go. It is small and light and you should have one in your pocket.
I use cotton balls soaked in vaseline for fire starters. Light, cheap, and effective. Always carry a compass. A map is nice when it's light, and a gps is great when it works, but in the dark, or fog, or when your batteries die, a compass will tell you which way is north. I got lost in the fog just the other day. My compass is about 1" in diameter and weighs next to nothing. I keep it in my pocket. I once went back in the dark for an elk shed a few hundred feet off the road. I got turned around and had no idea which way the road was. When I finally found the road, I didn't know which way the truck was. Keep survival essentials in your pockets. I hunt in Army BDU's just because of the colors and the pockets. I keep my neck warmer, glomitts, wool cap, and emergency kit (Bic lighter, fire starters, compass, Advil, whistle, mini flint/steel) and sunscreen in my pockets.