[miles]

Hiya

2 options. Firstly, you could install a through hull transducer, which will be fitted inside your hull. The downside is that you'll need to have access to the hull, which in most cases need a hole to be made in the deck.

Second option, is one many boat owners used here. A simple SS round tube, with a bracket which allows the tube to move up and down, locking it in place with a wingnut. This is mounted to your transom and the transducer mounted onto the bottom end of the SS round tube. When you've finished fishing, you simply screw the wingnut loose, pull the bar up, thereby raising the transducer ABOVE the water level and then tighten the wingnut again to lock it in place. Your transducer is now out of the water, away from any algae growth. Hope i explained that well enough......

Regards
miles