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.