Hi everyone. I have a 27 foot Boston Whaler and it sits in salt water all the time. After 3 years, the above transom transducer fell off the rear of the boat and, of course, it constantly gets covered with barnacles. I have a Garmin 3006-C that is hooked up to this transducer. I have temp, speed, sonar and debth with this transducer. I want to switch to an 'in the hull" transducer. I know I will lose water temp and speed but the Boat is only 3 years old and this P-66 transducer will not tolerate being in salt water all the time. 
My question is, does anyone know if I will be able to get sonar and debth capability with an "in the hull" transducer that Garmin offers on their web site? Thanks in advance for any replies. JOHN
My question is, does anyone know if I will be able to get sonar and debth capability with an "in the hull" transducer that Garmin offers on their web site? Thanks in advance for any replies. JOHN