I was part of the BATA team when he started the TT4 and worked with the tracker program. I still have the old tracker firmware and didn¡¯t know if it would work if I loaded it. I sold my BATA kit that I built but found a TT4 last year at Hamvention with the GPS so I picked it up. I found a harness that I built for my FT-530 and thought I would give it a try again. The one that I picked up was a surface mount V7. I can¡¯t see what chip is installed. The tracker program was easy to setup.