"Mxsmanic" wrote in message
...
Dave S writes:

Yes... YOU did....

Where?

TCAS uses at least one directional antenna. It is this antenna that
provides
azimuth information, independently of any equipment ATC might have. The
directional characteristic required for the antenna provides very low
azimuth
resolution, which means that bearing information on the TCAS display is
only
approximately accurate, unless the equipment substantially exceeds the
minimum
requirements for the system.

This is more or less correct. TCAS is also inaccurate in range compared to
a ground based sensor.