Forget about Â“RealtimeÂ” data on other aircraft in proximity. You only want information and location on other aircraft closer than 5 miles…otherwise it will make you crazy every time you hear the bell. I have flown with TCAS and it there is NO WAY you will receive reliable data (fast enough) from a up or downlink. It just happens too fast to rely on a data transmission from the other aircraft to a ground station, then to a computer, then back up to your aircraft. FORGETABOUTIT. Wx data 5 to 7 mins old is OK, but not TCAS or even lightning. Trust me on this.