wrote:


The best TCAS-like solution I've seen for busy areas is the radar
traffic (TIS) data available with a Mode/S transponder. The only
drawback is that you have to pony up for the Mode/S transponder and a
compatible display device. Still a lot cheaper that an actual TCAS.

TIS demonstrated it's worth to me in the first ten minutes I flew with
it. I departed from the radio shop on a hazy day and even though I
was getting flight following the thing showed an approaching aircraft
at my altitude. As it got closer I climbed to a different altitude.
I finally saw it as it passed beneath me. ATC never issued an
alert.