Raymarine B175M Bronze Low Profile 1000W D/T Through Hull Transducer 20° Angle

Raymarine B175M Bronze Low Profile 1000W D/T Through Hull Transducer 20° Angle

Raymarine B175M Bronze Low Profile 1000W D/T Through Hull Transducer 20° Angle is the gold standard for offshore anglers and serious coastal boaters who want professional-grade performance without the drag or hassle of a bulky fairing block.

The B175M is a 1kW, CHIRP-ready powerhouse designed for those who need a clear picture of the mid-water column and the seabed at depths where standard transducers struggle. Because it is a "tilted element" transducer, the ceramic internal components are permanently angled at 20° to counteract your boat's hull deadrise. This ensures the sonar beam points straight down at the sea floor, providing the most accurate returns possible.

Its low-profile bronze housing sits nearly flush to the hull (protruding less than 6.5mm), which significantly reduces drag and allows for clean, high-speed operation. This design also means your boat can safely sit on trailer rollers or bunks without the risk of damaging the transducer.

Raymarine B175M Bronze Low Profile 1000W D/T Through Hull Transducer 20° Angle Key Features

• Superior Target Separation: Utilising Medium-frequency CHIRP (85–135 kHz), this transducer excels at distinguishing individual baitfish and game fish in the mid-to-deep water column.
• Deep Water Capability: With a massive 1000W power rating, you can expect reliable depth tracking and clear bottom detail down to approximately 450 metres (1,500 feet).
• 20° Tilted Element: Specifically engineered for hulls with a deadrise angle of 16° to 24°. This clever internal tilt eliminates the need for a traditional fairing block, making for a much cleaner installation.
• All-in-One Data: Provides both highly accurate depth and fast-response water temperature readings directly to your Raymarine MFD.
• Robust Bronze Construction: Built to last in the harsh marine environment, the bronze housing is ideal for use on wood or fibreglass hulls.
• High-Speed Performance: The streamlined design ensures minimal turbulence, allowing your sonar to maintain a clear "lock" on the bottom even when you're cruising at speed.

Technical Specifications

• • Frequency: 85-135 kHz (Medium CHIRP)
  • Power: 1000 Watts (1kW)
  • Beamwidth: 16° to 24°
  • Mounting: Thru-Hull (95mm / 3.75" hole size)
  • Hull Compatibility: Fibreglass or Wood
  • Cable: Includes 10m (33ft) cable

Morgan Marine Expert Tip: To connect this transducer to your Raymarine Axiom or CP series sonar module, you may require a specific adapter cable depending on your current setup. If you are unsure about compatibility or need advice on the best mounting location for your hull, please get in touch with our team here at the chandlery – we're always happy to help you get the best out of your electronics.

Raymarine B175M Bronze Low Profile 1000W D/T Through Hull Transducer 20° Angle FAQs

What is the benefit of a "Tilted Element" transducer?

Traditionally, a through-hull transducer requires a large, bulky fairing block to ensure the sonar beam points straight down. The B175M features a "tilted element" where the internal ceramic components are pre-set at a 20° angle. This allows the transducer to be mounted nearly flush with your hull while the beam remains vertically oriented, providing better performance at high speeds and a much cleaner look on your hull.

How do I know if the 20° version is right for my boat?

The 20° tilt model is specifically designed for boats with a hull deadrise (the angle of the V-shape at the mounting location) of 16° to 24°. If your deadrise is lower, you would likely need the 12° or 0° versions. Getting this angle right is vital to ensuring your sonar beam points directly at the seabed.

What does "Medium CHIRP" (85–135 kHz) mean for my fishing?

The B175M operates in the medium frequency band. This is often considered the "sweet spot" for UK coastal and offshore waters. It offers a perfect balance: enough depth penetration to reach up to 457m (1,500ft) while still providing the high-resolution target separation needed to distinguish individual baitfish and structure in shallower water.

Is this transducer suitable for my hull material?

This is a bronze housing, which is ideally suited for fibreglass or wood hulls. If you have an aluminium or steel hull, please contact us about the stainless steel version (SS175M) to avoid galvanic corrosion.

Does it provide water temperature data?

Yes. The B175M is a Depth and Temperature (D/T) transducer. It features a fast-response water-temperature sensor, which is essential for anglers looking for thermal breaks where fish are likely to congregate.

Can I install this on a boat that stays on a trailer?

Absolutely. Because of its low-profile design, the B175M protrudes less than 6.3mm (1/4 inch) outside the hull. This means it won't interfere with trailer rollers or bunks, making it an excellent upgrade for high-performance RIBs and sports boats.

Which Raymarine sonar modules or displays are compatible?

The B175M is designed to work with Raymarine’s CHIRP-enabled systems. It is compatible with the CP470 and CP570 sonar modules, as well as Axiom Pro and Axiom 2 Pro models.

Do I need any extra cables for installation?

Yes, usually. To connect this transducer to a single-transducer sonar port (like on an Axiom Pro), you will typically require the A80328 adapter cable. If you are running a pair of transducers (e.g., a Low and a Medium), a different Y-cable (A102146) would be required. If you're unsure, just give the Morgan Marine team a call and we can confirm exactly what you need for your specific MFD.

What size hole needs to be cut in the hull?

Installation requires a 95mm (3-3/4") hole. We always recommend professional installation for through-hull fittings to ensure a watertight and safe seal.

Why should I choose the 1kW B175M over a 600W transducer?

Power is key when it comes to "seeing" through the water column. The 1000W output of the B175M provides much greater sensitivity. You’ll get a clearer picture in deeper water and significantly better "bottom tracking" when travelling at cruising speeds compared to lower-powered units.

Need more help?

If you have any further questions about compatibility or installation, the team here at Morgan Marine in Brightlingsea are experts in Raymarine systems. Feel free to reach out before you place your order!