When SHTF, being able to communicate with your loved ones, emergency services, other survivors, and the other members of your crew is going to be a make or break situation.
If you have no way of communicating, you have no way of knowing whether or not a certain area is safe, what the overall situation is, what sorts of supplies others have for which you can barter, or what sorts of threats are apparent at any given time.
In the good old days, communication was as simple a process as running a message with a horseman or a pigeon. You could also send smoke signals or flash code with your light at night.
With the development of new technologies, these techniques are all but dead. What sorts of technologies have replaced them? Find out on the next page.