Interesting article
TCAS Traffic Display
Of note:
ICAO PANS-OPS, Doc 8168 states: "Pilots shall not manoeuvre their aircraft in response to traffic advisories (TAs) only".
So if we go down the route above of a "TCAS type" system, but with TAs only, it will be hard to relate to TCAS where we are not allowed to manoeuvre based on a TA (only).
I am not 100% against such systems... but the implications of bringing such systems in would need to be very carefully evaluated / applied. As above, what do you do if your "system" advises you, or indicates such that you wish, to manouevre whilst under a Radar Service? Do you disobey ATC?
Even if you "relegate" the system to vertical avoidance only (as above, whilst TCAS is pretty good at bearing info, it is fallible, and can easily make a safe situation catastrophic if believed), without an RA "decision" process - it can again lead to problems... TCAS uses "crossing RAs", where an aircraft above you, but descending, might ask you to climb... so a GA system where a pilot seeing an aircraft "above" (but not appreciate / judge it's high RoD) might descend and now create a collision.
If the sole purpose of such devices is to "lead your eyes to the traffic", and then take action based on the resulting visual sighting, then it would seem a benefit (provided the accuracy is such that it does not have you looking in the wrong place
). But a device that causes you to manoeuvre, based on it's information alone, is going to generate almost (?) as many problems as it solves IMHO...
NoD