Peter Duniho wrote:

wrote in message ...
That is exactly what a TCAS RA does, and it relies on "unverified" Mode C.

As I mentioned, this is not as safe as people (i.e. you) would like to
think.

It has already saved a few friends of mine, in one case IFR vs. IFR in the
flight levels. Perhaps it is not as safe as it could be, but it's a lot safer
than not having it at all. Same goes for GPWS and EGPWS.