Airmar B75M Bronze 20-Degree 600W Thru-Hull Transducer

The Airmar B75M Bronze 20-Degree 600W Thru-Hull Transducer is a medium-band CHIRP transducer that sweeps from 80 to 130 kHz. That gives 50 kHz of total bandwidth and covers the popular 88 and 107 kHz fishing frequencies. The beam narrows from 24 to 16 degrees across the sweep.

CHIRP gives much more detail than single-frequency sonar, so you can tell individual baitfish, gamefish and structure apart. The medium band is a good all-around choice for inshore and mid-depth fishing. A fast-response water temperature sensor is built in.

The ceramic element sits at a fixed 20 degree tilt inside the housing, which suits hulls with 16 to 24 degree deadrise. With the transducer mounted nearly flush, that tilt cancels out the hull angle and points the beam straight down for the strongest echo returns. It runs at 600 watts and suits boats up to about 25 ft. Airmar's Xducer ID technology lets a compatible fish finder recognize the transducer and set itself up automatically. This model needs a separate Airmar Mix and Match cable for your brand of display, sold separately. If you change electronics brands later, you can leave the transducer in the hull and just swap the cable. The bronze housing is for fiberglass or wood hulls, so check your hull material before ordering. A thru-hull install means drilling the hull, so many owners have it done at haul-out by a qualified installer. Other transducers are in our marine transducers section.

• Medium CHIRP from 80 to 130 kHz.
• Covers 88 and 107 kHz.
• 20 degree tilt.
• Built-in temperature sensor.