Interesting commentary regarding problems with the Navigator. I have had a Navigator for about 18 months. I have used it with the 756P3 and now with the 7700 and no problems what so ever. I caution that RTFM is a must and the instructions are pretty straight forward. Interestingly I helped a fellow ham who was having all sorts of issiues with his Navigator and the 7700. Once I saw a screen shot of the display it seem quite obvious to me the program was being overdriven from the navigator. I sent him a screen shot of what I was seeing on the display (psk) and it was like night and day. He backed off the drive from the navigator and it appears he is happy with the results. There are a lot of things that come into play and perhaps the most important one is patience and sometimes common sense.
Don - kx9q