I have a little problem with the ticker, so it's always a concern when we're in the backwoods. When we set up camp now, we get a GPS reading and write it down so we don't have to fumble for it in an emergency. We also write down the road number we're camping on and the distance to the nearest turn off.
As an added benefit, we've given this same info to friends and family that wanted to drop by for a visit.
BTW, we sometimes camp in areas without cell phone coverage, so we always have a ham radio with us. It can be invaluable if you have an emergency and no cell coverage. If anyone is ever interested in becoming an amateur radio operator, you no longer have to learn Morse code to get your license.