Raymarine B75 Through-Hull CHIRP Transducer, 600W, Bronze

Overview

The Raymarine B75 is a bronze through-hull CHIRP transducer with Tilted Element technology for boats that need depth and temperature data without a fairing block. The low-profile housing sits almost flush with the hull, while the fixed ceramic tilt helps aim the sonar beam straight down after installation on a compatible deadrise angle.

This B75 range is built for fiberglass and wood hulls and records depth and water temperature. Each model is rated at 600 W RMS and includes a 33 ft. / 10 m cable. Medium CHIRP models operate from 80 to 130 kHz with depth capability up to 900 ft, while High CHIRP models operate from 130 to 210 kHz with depth capability up to 700 ft.

It suits small and medium trailerable boats, center consoles, and fishing boats where a compact through-hull transducer is preferred over a larger fairing installation. The correct version depends mainly on hull deadrise and whether the system calls for Medium CHIRP coverage or High CHIRP detail.

Key features

• Bronze through-hull body for fiberglass and wood hull installations.
• Tilted Element technology helps aim the sonar beam downward without a separate fairing block.
• Low-profile shape keeps the installation close to the hull surface.
• 600 W RMS rating across the listed B75 configurations.
• Depth and temperature sensing in one transducer.
• Medium CHIRP versions operate from 80 to 130 kHz with a 24° to 16° beam width.
• High CHIRP versions operate from 130 to 210 kHz with a 15° to 9° beam width.
• Available tilt angles cover common deadrise ranges: 0° for 0° to 7°, 12° for 8° to 15°, and 20° for 16° to 24°.
• Includes a 33 ft. / 10 m cable for routing from the hull location to the sonar module area.

Variants

This B75 transducer is offered in multiple configurations so the installation can match the hull angle and sonar frequency band. The two main choices are the CHIRP band and the fixed tilt angle.

The bronze through-hull body, 600 W RMS rating, depth and temperature sensing, 33 ft. / 10 m cable length, and fiberglass or wood hull compatibility remain consistent across these listed variants.

• A80018: High frequency band with 0° tilt angle. This version fits hull deadrise from 0° to 7° and uses High CHIRP for tighter target detail under the boat.
• A80034: Medium frequency band with 12° tilt angle. This version fits hull deadrise from 8° to 15° and uses Medium CHIRP for broader coverage in shallow to mid-depth water.
• A80035: High frequency band with 12° tilt angle. This version fits hull deadrise from 8° to 15° and uses High CHIRP when fish target separation and structure detail matter most.
• A80036: Medium frequency band with 20° tilt angle. This version fits hull deadrise from 16° to 24° and gives Medium CHIRP coverage for hulls with a steeper V shape.
• A80037: High frequency band with 20° tilt angle. This version fits hull deadrise from 16° to 24° and keeps the High CHIRP beam aimed downward on steeper hull sections.

Installation and setup

The B75 is a through-hull transducer, so hull location, deadrise measurement, and access inside the boat should be checked before drilling. The transducer should be mounted where it stays in clean water flow when the boat is running, away from turbulence caused by strakes, thru-hulls, steps, or trailer bunks.

For a single B75 installation, use the required single operation cable A80328. Pair installations use a transducer Y-cable A012146, and extension cables are available in 3 m, 5 m, and 10 m lengths when the sonar module is farther from the mounting point.

Compatibility and fit

The B75 range is intended for Raymarine Axiom Pro-series displays and CHIRP sonar module installations that support this transducer type. Matching the tilt angle to the hull deadrise is important because the ceramic element angle is fixed inside the housing.

Medium CHIRP versions are a practical match for crews that want more bottom coverage in shallow and medium depths. High CHIRP versions are a better fit when the priority is clearer separation of fish targets around reefs, wrecks, structure, and bait schools.

Maintenance and care

Like any through-hull transducer, the exposed face should be kept clean so marine growth does not block sonar returns. Inspect the housing, cable run, and internal seal area during regular haul-outs or service work, especially after long saltwater use or trailer transport.