Garmin AIRMAR B265LH

Garmin AIRMAR B265LH

Garmin AIRMAR B265LH is our premier 1kW thru-hull transducer, designed for the angler who refuses to compromise on clarity, depth, or target separation.

Whether you are tracking deep-water canyons or pinpointing tight-holding fish in complex structures, this dual-band CHIRP powerhouse provides the "commercial grade" detail needed to transform your fishing success. By spreading the energy across a wide range of frequencies, the B265LH delivers stunning resolution and bottom discrimination that 

This is the "gold standard" for offshore performance. The Low-frequency band excels at deep-water performance (reaching depths of up to 3,000ft), while the High-frequency band provides a narrow beam (6° to 10°) that is perfect for picking apart wrecks and reefs. For those targeting specific species, the B265LH is fully tuneable, allowing you to dial in the exact frequencies known to excel for certain fish—such as 60 kHz for Bluefin Tuna or 175 kHz for Cod.

Garmin AIRMAR B265LH Key Features

• 1kW Power Output: High-performance output for exceptional deep-water capability and water column detail.
• Dual-Band CHIRP: Operates across Low and High frequency bands simultaneously (42-65 kHz and 130-210 kHz) to cover the entire water column.
• Superior Depth Range: Reaches depths of up to 914m (3,000ft) on low frequency and 304m (1,000ft) on high frequency.
• Precision Targeting: High-frequency narrow beamwidth (10° to 6°) provides incredible detail for structure and baitfish separation.
• Integrated Sensors: Provides both highly accurate depth data and fast-response water temperature readings.
• High-Speed Performance: Supplied with a high-performance fairing block, ensuring clean sonar returns and broadband performance at speeds over 30 knots.
• Durable Bronze Housing: Built to last in the harshest marine environments; suitable for fiberglass or wood hulls.
• Garmin Compatibility: Features a 12-pin connector for seamless integration with Garmin GPSMAP xsv series and GSD 25 sonar modules.

Technical Specifications:

• • Frequency: 42-65 kHz (Low) / 130-210 kHz (High)
  • Beamwidth: 16°-25° (Low) / 6°-10° (High)
  • Hull Deadrise: Supports up to 20° with the included fairing block.
  • Weight: 7.3 kg

Morgan Marine Expert Tip: When installing thru-hull transducers, precision is key. If you have questions regarding hull compatibility or the best mounting location for your specific vessel, please contact our technical team for advice.

Garmin AIRMAR B265LH FAQs

What exactly is the B265LH, and why is it considered a "powerhouse"?

The B265LH is a 1kW CHIRP-ready thru-hull transducer. The "1kW" refers to its power rating, which is significantly higher than standard 600W units. This extra power, combined with its large ceramic arrays, allows it to punch through the water column to reveal incredible detail at depths where other transducers fail. It provides both Low and High frequency bands in a single bronze housing.

What are the depth capabilities of this transducer?

This is where the B265LH really shines.

• • Low Frequency (42–65 kHz): Can reach depths of up to 914 metres (3,000 feet). It’s perfect for deep-dropping and finding bottom structure in the deep blue.
  • High Frequency (130–210 kHz): Provides high-resolution detail down to approximately 304 metres (1,000 feet). This band is your "detail" channel, perfect for picking apart bait balls and identifying specific fish targets holding tight to wrecks.

What is the difference between the "Low" and "High" bands?

Low Band (Wide Beam): Has a beamwidth of 25° to 16°. It’s designed to search a wide area under the boat, making it ideal for deep-water performance and finding the general location of fish.

High Band (Narrow Beam): Has a much tighter 10° to 6° beam. This focuses the energy into a narrow "searchlight," providing the crispest possible target separation. If you want to see the gap between a predator and a bait ball, this is the band you use.

Will it fit my boat?

The B265LH is a thru-hull transducer with a bronze housing.

• • Hull Material: It is designed for fiberglass or wood hulls. (Note: Do not install bronze transducers in aluminium or steel hulls, as this causes galvanic corrosion).
  • Deadrise: It comes with a high-performance fairing block. This allows the transducer to be mounted on hulls with a deadrise angle of up to 20 degrees, ensuring the beam points straight down.
  • Vessel Size: We typically recommend this for boats 8 metres (25 feet) and above.

Does it measure temperature and speed?

The B265LH includes a highly accurate, fast-response water temperature sensor. It does not have a mechanical speed paddlewheel; speed is usually provided via your Garmin chartplotter’s GPS.

What is the "High-Performance Fairing" for?

The included fairing block is crucial. Not only does it level the transducer against your hull’s deadrise, but its aerodynamic shape also ensures a smooth flow of "clean" water (free of air bubbles) over the transducer face. This allows the unit to maintain a clear bottom lock and return clean sonar images even at speeds exceeding 30 knots.

Which Garmin units is it compatible with?

The B265LH is compatible with most modern Garmin CHIRP-enabled sonar modules and chartplotters, including the GPSMAP® series (e.g., 723xsv, 923xsv, 1223xsv) and the GSD™ 25 or GSD™ 26 remote sonar boxes. If you aren't sure which connector your specific unit uses (12-pin vs 8-pin), please give us a ring and we can verify the exact adapter or cable you need.

Is this better than the B275LHW (Wide) model?

It depends on how you fish. The B265LH (this model) has a narrow high-frequency beam, which is better for pinpointing fish in deep water or near structure. The B275LHW has a "High Wide" beam, which is better for searching the top 500ft of the water column for pelagic fish like tuna. If you do a mix of reef fishing and deep-dropping, the B265LH is generally the superior all-rounder.