From time to time, someone will pop up with the idea that the time-honored practice of visual traffic separation—often known as “see and be seen”—is too archaic for modern aircraft. Anything that flies, so the theory goes, should have some kind of automated collision avoidance system which does exist but will solve all potential conflicts between aircraft of all sizes. Someday, perhaps, but until then most of us are “stuck” using see and be seen.

