Hi Mark . I believe it's Safe to say it was the Freighter version. I was the friend helping Jonathan with this issue. I too, for the life of me could not duplicate this. I was working online with him and he differently knows how to use the GPS as he uses it in many other aircraft. It acts like the NAV/GPS button isn't switching modes reading the GPS data. It's diffidently an anomaly unique to the CS 737 but not for all?