Sometimes we have issues with speed, temp or depth and we need to replace or identify what transducer we have. Gemeco is owned by Airmar. Airmar has been making transducers for the marine market for decades. Gemeco has some great information. You have to have a business account to order from them but their web site has some very helpful information Especially when it comes to transducer identification. Here is that link to Gemeco. There is a transducer identification tab to the left of the Support tab. Enjoy. https://www.gemeco.com/st_thruhull.php
David