Of course there is no such box but you knew that
The point here is that technologies exist which are a lot better than the traditionalist-favourite Mk1 eyeball.
If people
who can have transponders (the great majority of planes that actually fly for real, and I don't mean the 1-in-a-million Thruster pilot/adventurer who flew all the way to Kahtmandu) put in a straight
Mode C unit, we would get
- a meaningful RIS, without the useless "level unknown" majority of reports
- TCAS activation in commercial aircraft, protecting GA's interests against the regulators
- TCAS activation in private aircraft whose owners have chosen to spend the money
- less resistance to CAS transits
- less resistance to CAS expansion (to a large degree because non-mode-C traffic flying under CAS has to be assumed to be OCAS, and thus far the luck in that daft assumption has held up, despite the hundreds of known CAS busts each year...)
As 421C says, it is completely misleading to suggest that non-powered ultralights or whatever make up the majority of GA. They do occassionally bust some piece of airspace as a group of 20+, all flying together, but that isn't quite the same thing