tightlines
Well-Known Member
I had the exact same issue with a C120 for years. I even replaced the thru hull transducer, thinking that was issue and DSM 300 was still intermittent in working. How many hours have you spent researching the DSM 300? Haha - those things are a complete nightmare. I ended up just removing the DSM 300 completely. I bought a used Raymarine A series with built in sonar and used this to hookup to the thru hull transducer and placed at helm for Sonar. The benefit is the A series unit has built in GPS as a backup. The C120 still functions great as radar and GPS. Way more economical than a complete refit. I also added a stern Dragonfly chirp sonar. We rarely use the helm sonar now anyways.
Cheers

Cheers

