AIRMAR® B75M (20° tilt)

The AIRMAR® B75M transducer is a 600 W bronze through-hull transducer designed by Airmar and distributed by Garmin. It features CHIRP mid-band technology and is specifically engineered with a 20° tilt to compensate for hull angle and ensure a vertical beam.

This transducer has a power output of 600 W (watts). This power rating indicates its ability to transmit and receive sound signals to detect seabeds and fish.

The AIRMAR® B75M transducer operates on a medium-frequency band (Medium CHIRP), ranging from 80 kHz to 130 kHz. This frequency range provides an excellent balance between deep penetration and target resolution.

The AIRMAR® B75M transducer can display seafloor details and detect targets down to a maximum depth of 274 meters (approximately 900 feet).

The beam width of the B75M depth sounder varies depending on the frequency used. It ranges from 24° to 16°. A wider beam covers a larger area, while a narrower beam provides better target definition.

The AIRMAR® B75M uses CHIRP technology. This technology sends a continuous sweep of frequencies over a wide band (here, from 80 kHz to 130 kHz) rather than a single frequency, resulting in clearer images, better target separation, and more accurate detection at different depths.

The AIRMAR® B75M transducer is made of bronze. This material is robust and perfectly suited for through-hull installation on fiberglass or wooden hulls.

A 20° tilt indicates that the transducer is designed to be installed on hulls with a deadrise angle (V-shaped hull angle) between 16° and 24°. This internal tilt compensates for the hull’s angle and directs the sonar beam straight to the seabed, ensuring optimal performance.

The CHIRP mid-band technology (80-130 kHz) provides an excellent compromise. It offers good deep penetration, similar to low frequencies, while delivering superior target resolution and echo separation, close to high frequencies. This is ideal for fish detection and seabed mapping at intermediate depths.

The AIRMAR® B75M transducer is primarily designed for marine applications and sea fishing, thanks to its power, maximum depth, and CHIRP frequency range suited to marine environments.

The AIRMAR® B75M transducer is compatible with Garmin displays (fishfinders/chartplotters) that support 600 W CHIRP transducers and have an 8-pin connector. This typically includes Garmin echoMAP CHIRP, STRIKER CHIRP, and GPSMAP series displays that are compatible with this technology.

The AIRMAR® B75M transducer is equipped with an 8-pin connector specific to compatible Garmin devices. It is essential to verify that your Garmin device has this type of transducer connection port.

Being made of bronze, the AIRMAR® B75M transducer is ideal for installation on fiberglass and wood hulls. It is not recommended for installation on aluminum or steel hulls due to the risk of galvanic corrosion.

No, the AIRMAR® B75M transducer is a CHIRP transducer and requires a fishfinder or a Garmin display compatible with CHIRP technology to operate correctly and fully utilize its capabilities. It will not work with traditional fixed-frequency fishfinder systems.

This is a through-hull transducer. This means it is installed by drilling a hole in the boat’s hull, with the transducer body passing through the hull and secured from the inside. This method ensures optimal performance as the transducer is in direct contact with the water, without obstruction.

The B75M transducer with a 20° tilt is specifically designed for boats where the deadrise angle (angle of the hull’s V-shape at the transducer location) is between 16° and 24°. The internal tilt of the transducer compensates for this angle so that the sonar beam is directed vertically toward the seabed.

Yes, installing the AIRMAR® B75M transducer, which is a through-hull model, requires drilling a hole in your boat’s hull. It is critical to strictly follow the installation manual instructions to ensure watertight integrity and safety.

For optimal performance, the transducer must be mounted in an area of the hull where water flow is most laminar (turbulence-free) and free of air bubbles, typically forward and amidships, away from propellers, keels, chines, and other appendages that could create turbulence. Consult the installation manual for precise guidelines.