Raymarine B265LM D/T Through Hull Low-Medium Transducer

Raymarine B265LM D/T Through Hull Low-Medium Transducer

Raymarine B265LM D/T Through Hull Low-Medium Transducer is a 1kW, powerhouse CHIRP-ready through-hull transducer designed for the angler who refuses to compromise on detail. Whether you are scouting coastal reefs or tracking deep-water canyons, this bronze powerhouse provides the ultimate window into the world beneath your hull.

Equipped with eight internal ceramics, the B265LM offers a massive 103kHz of total bandwidth. By combining Low and Medium frequency bands, it delivers a versatile "best of both worlds" performance. The Low-frequency band (42–65 kHz) punches deep—reaching depths of up to 914m (3,000ft)—to find structure and bait in the abyss. Meanwhile, the Medium-frequency band (85–135 kHz) provides exceptional target separation, making it much easier to distinguish individual fish holding tight to the bottom or suspended in the water column.

Supplied with a high-performance fairing block, the B265LM is engineered for optimal performance even at speeds over 30 knots, ensuring your screen stays clear and your data remains accurate when you’re on the move.

Raymarine B265LM D/T Through Hull Low-Medium Transducer Key Features

• Dual-Band CHIRP Technology: Combines Low (42–65 kHz) and Medium (85–135 kHz) frequencies for incredible versatility across all depths.
• Exceptional Depth Performance: Reaches up to 914m (3,000ft) on the Low band and 457m (1,500ft) on the Medium band.
• Precision Target Separation: Features a 16° to 11° beamwidth on the Medium band, perfect for identifying fish near structure or on the seabed.
• Integrated Sensors: Provides both high-accuracy Depth and fast-response Water-Temperature data to your display
• 1kW Power Rating: A true professional-grade transducer designed for boats 8m (25ft) and above.
• High-Speed Fairing Included: The included fairing block ensures a clean water flow over the transducer face, allowing for clear readings at speeds exceeding 30 knots.
• Built for Durability: Rugged bronze housing suitable for both fiberglass and wooden hulls.
• Plug-and-Play Compatibility: Fitted with an 11-pin connector for direct connection to Raymarine Axiom Pro, Axiom 2 Pro, CP470, and CP570 sonar modules.

Technical Specifications:

• • Material: Bronze
  • Power: 1kW
  • Frequencies: Low (42-65 kHz) / Medium (85-135 kHz)
  • Beamwidth: 25°–16° (Low) / 16°–11° (Medium)
  • Hull Deadrise: 0° to 20° (with fairing)
  • Cable Length: 10m (33ft)

Morgan Marine Advice: This "LM" version is an excellent choice for UK coastal waters where the medium frequency provides a wider coverage area than the "LH" (High) model, making it easier to find and stay on the fish in moderate depths.

Raymarine B265LM D/T Through Hull Low-Medium Transducer FAQs

What exactly does "Low-Medium" (LM) mean for my fishing?

The B265LM uses two distinct frequency bands to give you the best of both worlds. The Low frequency (42–65 kHz) is your deep-water specialist, capable of tracking the bottom down to roughly 3,000 feet (914 metres). The Medium frequency (85–135 kHz) is the "sweet spot" for many UK boaters; it provides excellent target separation at moderate depths and is particularly effective at showing fish holding tight to the bottom in 100 to 500 feet of water.

Why should I choose the LM version over the LH (Low-High) version?

It comes down to beam width and depth. The Medium element in this transducer has a wider beam (16° to 11°) compared to the High-frequency version. This means you cover more area under the boat, which is often preferred by coastal anglers looking for schools of fish. If you find yourself fishing in mid-depths more often than very deep or very shallow water, the LM is typically the more versatile choice.

What hull materials is this transducer compatible with?

Because this is a Bronze through-hull transducer, it is designed specifically for GRP (Fibreglass) and Wood hulls.

Crucial Note: It should never be installed in a metal hull (Aluminium or Steel), as the interaction between the bronze and the metal will cause galvanic corrosion, which can damage your hull and the transducer.

My boat has a significant V-shape. Will this work on a deadrise?

Yes. The B265LM comes with a High-Performance Fairing Block. When cut to the angle of your hull, this block allows the transducer to sit perfectly vertical, ensuring the sonar beam points straight down. It is suitable for hulls with a deadrise angle of up to 20 degrees.

Can I use this transducer while at cruising speeds?

One of the best features of the B265LM is its design for performance. When installed with the included fairing block, it provides a clean flow of water over the transducer face. This allows for "crystal clear" sonar readings at speeds well over 30 knots, provided it is installed in a location free from aerated water or turbulence.

Which Raymarine displays is this compatible with?

The B265LM is a 1kW CHIRP transducer fitted with Raymarine’s 11-pin connector. It is a direct "plug and play" fit for:

• • Axiom Pro / Axiom 2 Pro (RVX and RVM models)
  • CP470 / CP570 Professional Sonar Modules
  • RVX1000 / RVM1600 High-Performance Sonar Modules

Does it measure more than just depth?

Yes, the B265LM is a D/T (Depth and Temperature) unit. It features a highly sensitive, fast-response internal thermistor that provides accurate sea surface temperature readings—essential for finding the "temperature breaks" where fish often congregate.

How big is the unit? Should I be worried about its size?

The B265 is a substantial, professional-grade transducer containing 8 internal ceramics. It is much larger than a standard 600W transducer. Because of its size and the need for a fairing block, we generally recommend this for vessels of 8 metres (25 feet) and above.