GPS has always been in my staying found kit. There's one on the dashboard of my car and a smaller non-mappping unit in my backpack with the map. It isn't for emergency use only, it's for everyday use. You still need to stay current with map and compass just in case the GPS dies.

As for the firearm, that's a personal decision based on the individual and the situation they may find themselves. But I wouldn't bury a 9mm or .38Spl in a survival kit either. I'd wear it in a holster where I can get to it quickly when the need arises. Most of the time you don't need a gun for survival, but when you do it's no time to open up a pack. Cougar and other people can be serious threats.