Communications Security (COMSEC)
COMSEC would include any electronic communications such as email, text messages, and postings on social media websites.
Who What When and Where
Who are you, someone may want to know, what are you doing, someone may want to know this as well, when is something going to happen, and where is it going to happen is relevant information that must be safeguarded when communicating electronically.
Radio signals can be intercepted and with a directional antenna someone can determine your location by triangulation. All it requires is three bearings from three different locations. Where the bearings intersect is your location.
It is not quite as easy as described for those that have never triangulated a signal, but with a little practice and some knowledge of radio transmissions virtually anyone can do it.
Typically, someone would be monitoring radio traffic for information, and then decide based on…