The standard cable length on Raymarine's transducers for A series and C/E series with built in sonar is 33-feet (10-meters). This extension cable will add an additional 9.8 feet (3 meters) to the transducer cable.

Note: For optimal performance, Raymarine does not recommend using more than two extension cables on any transducer cable run.
Transducer Extension Cable, 3M

Transducer extension cable for DS400x, DS500x, DS600x and DSM25 (A65) fishfinders.

3 meter extension cable extends the length of your stock transducer cable for extra-long runs on larger vessels. Plug-together connections for fast and easy installation. Note: For optimum performance Raymarine recommends adding no more than 3 extension cables to any given transducer cable.