For those who are using TCAS and its less functional poor cousins, are you solely using it to determine traffic in a vertical plane, or do you think it's some kind of pseudo radar giving you accurate horizontal awareness as well ?
It's a great piece of kit, but you need to understand the philosophy behind its design and the inherent innaccuracies if you use it in a different way from that intended by the manufacturers and those who specify the industry standard for ACAS devices.
It is truly astonishing to see how many people out there use TCAS as a panacea and who have no idea of how it really works or what it is there for.
One can even find certain "professionals" shrugging off bad practice with "He's got TCAS anyway."
Have had some very serious words with folks over here about it.