Due to lack of space within my sump area, and the angle that the hull comes into it at, I don't think I will ever be able to mount my transducer inside the boat
However, reading up, it's not a Garmin part that's at fault here I don't think, it's just a bit unfortunate that they use airmar - my ff is a 160 blue, with an airmar p66 I think. It's a massive lump, but when I owned my last 160 blue, the transducer was much smaller, and far more reliable. Looking through the airmar website, I think this is the one :-
It looks like the one I used to own, which worked perfectly on the transom at all speeds, and never popped up when hitting waves or bouncing around..... does anyone else have one of these, and more to the point, is there a recommended dealer that sells these things directly?