Hummingbird factory install

TRANSDUCER. CHANGE THE PUCK THAT SHOOTS THROUGH THE HULL. PLUG THE EXTERNAL TRANSDUCER STRAIGHT TO THE UNIT IF IT HAS SONAR TRANSDUCER BAD.

Probably the installation of the shoot thru hull TD. It may be loose, or not far enough back – thus having air between itself and the water. Or the TD itself might be bad.Had that problem with HB setup or prior boats. At low speed it gets the depth from the sv/dv transducer and is suppose to switch to the in hull automatically once on plane.You may also want to verify that the software on the 1198 is current, HB has issued updates to correct problems like this in the past.The most current version is 7.660 (I switched brands a year ago, but you might need at least 7.5** ). I would start with this first, then check the in hull mount. You can also disconnect the sv/dv td from the Y cable and verify you are getting good depth readings at low speed, the high speed consistently to verify the in hull TD is ok.Last edited by catmantwo on February 22nd, 2016, 11:44 pm, edited 1 time in total.Your Signature …

It is quite possible that the transducer is busted loose inside the puck. All major transducers are made by one manufacturer and subject to the same issues no matter the brand. Contacting HumminBird will get you some help on where to start. We think it obviously worked new and is a later factor. This is now 4-5 years on it and who knows the situation. The hull will loose depth readings at between 45 and 60 MPH depending on the angle of the trim. More trim, more air, less reading. Less trim, more hull in the water and more depth readings. We think its either a loose transducer or faulty one and you need a new trransducer.