Originally Posted by Steve6443
PCAS will only work if the traffic is squawking.
Exactly, but many people think PCAS is just as good as TCAS in transport aircraft. PCAS only displays traffic, which get interrogations from SSR/TCAS, but it won't work in the middle of Sahara or when flying low-level in moderately high terrai, since there are no SSR interrogations.
One of the problems is airspace structure, since most of airspace in Europe is controlled above 1000ft AGL / 3000ft MSL and many (if not most) controllers don't like to see "crazy VFR traffic" in their airspace, so the only option for non-IR rated pilots (or aircraft not IFR equipped) is to fly below inversion level and it's nearly impossible to spot any traffic when flying in mist with sun at 12 o'clock.