Hi,<br />I am an Elecctrical and Electronic Engineer. I am trying to develop a fish finder / depth transducer system which can be installed without drilling a hole through the boat hull (Thru-hull transducer system).<br /><br />I wanted some information on the electrical specification for depth transducers. I have found lots of websites with mechanical and instalation instructions for transducers but none with the actual electronic specifications. Any help would be much appreciated.<br />Thanks