The modern communications network is quite the marvel of modern technology. It’s both an awesome and powerful system to behold. Unfortunately, it isn’t nearly as fail-proof as many would believe it to be. The whole system teeters on a complex network of electricity driven, precision electronics working together in concert. One nice solar flare or a series of EMPs (perhaps due to air-burst nuclear weapons) and it’s all toast in a matter of minutes. Those are the extreme cases.
What, however, if it’s as simple as getting lost and separated from your hiking group and the batteries in your handheld radio die? How do you leave messages along the trail to let people know where you’re going or what your condition is? How do you let others that come behind you know that the bridge ahead is unsafe?
Survival communication takes many forms including morse code, HAM & CB radio, smoke signals, trail signs and even carrier pigeons.