I have just replaced my Himminbird 717 with a 798c. I placed the new transducer where the old one was located and went for a run. The 717 worked fine upto 20knots.
On the 798 the 2d sonar dropped out once i got on the plane at 13knots. I would get not pictur3e and measurement between 1 ft and 500ft. I then assumed it was too high.
I have since dropped the transuder down 10mm and will give it a run on the weekend.
Can someone have a look at my current setup and give me some feedback please.