I think some of you are missing the point, the idea is to have a number of defences (layers), with eyes (see and avoid) being the last line of defence. I would prefer not to be relying on my ageing eyes as the only defence, it is much easier to spot someone whom you have spoken to, been advised by ATC, or seen on TCAS.
HH, yep, agree. It has been proven in many studies that alerted see and avoid works. Un-alerted, good luck with that
I've only had one instance where I passed about 200 ft directly above a crossing aircraft in the GAFA. Didn't see it till it flashed out the other side, scared the ****e out of me. I don't have a problem with people advocating no radio, no transponders............
in the appropriate areas.