After I had problems with the Doppler navigation, I switched to the CIVA INS. That was back at v1.0/1.1! By v1.3, the Doppler Navigation is much better. It still turns left/right when you are changing the heading of the next Leg, but it never goes uncontrollable (at least not for me). INS is better (IMO), but the Doppler Navigation is a lot of fun when flying overseas (well not just overseas, everywhere). We cheat because we have a map, and I went a step further by adding the default GPS 500 to it. :D ;D