Airmar P79D Plastic In-Hull 235Khz Transducer

This Airmar echosounder is easy to install on the inside of your boat. You can place the depth gauge on a slope of MAX 22 degrees. With this depth gauge you do not have to drill separate holes in the hull. Simply attach the depth gauge to the inside of the hull and fill it with anti-freeze. 

You can also easily integrate the depth gauge into your NMEA 2000 network