Garmin Bronze Thru-Hull Mount Transducer with Depth & Temperature (20° tilt) - Airmar B150M
The entry level CHIRP solution provides good depth capability and target separation.
This 8-pin 300 W bronze thru-hull mount transducer has a depth of 1,500 ft; an operating frequency of 95-155 kHz; a beamwidth of 26/17 degrees; and a 16 to 24 degree deadrise.
Transducer kit comes with installation instructions. Follow the instructions carefully to avoid damaging your boat.