so the suction cup is above the water line. does the transducer itself end up below waterline the way it's designed ? or are you saying ok to have transducer itself above the water line if you are going slow?

thanks

meanwhile .........i see a rental shop in marathon fl has a 20 foot mako with sonar, livewell, etc. $197 for the day.

http://qualityboats.net/staticpages/index.php/Rental_Boats_Marathon_Florida_Keys

saw a related tip in field and stream. attach transducer to a board and u-clamp the board to the transom so that the ducer is under water and below turbulemce. in the case we're discussing ( portable sonar with suction cup connection), i guess the board would have to be plastic or polyurethane coated.

hey gus.
i wouldn't mind having it if it's not an inconvenience. thanks.