Whenever I plug in to work traffic, well over half the targets on my scope are unidentified VFR targets. There could be over a hundred depending on the hour. Each is perfectly legal, remaining clear of all Class B, C and D airspace. Through this swarm of activity, I work my identified IFR and VFR flight-following traffic. The unpredictability of these mystery aircraft can get interesting. Is a target a sightseeing Cessna, a cross-country Diamond, or a photo mission Navajo doing imaging laps? It can get particularly dicey if my airspace contains an Alert Area full of civilian or military trainers doing their thing.
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