Furuno B265LH Thru-Hull CHIRP Transducer

Imagine gliding through deep offshore waters, your boat cutting cleanly through waves, while your sonar paints a crystal-clear picture of the seafloor thousands of feet below. That's the power of the Furuno B265LH thru-hull CHIRP transducer in action. Unlike old-school fish finders stuck on single frequencies, this broadband beast sweeps across a wide range of frequencies, delivering unmatched detail and target separation that turns guesswork into precision hunting.

Crafted from durable bronze for thru-hull mounting on fiberglass or wood hulls starting at 25 feet, the B265LH thrives in demanding conditions. Its low-frequency band (42-65 kHz) punches through to 3,000 feet for spotting massive structures and schools in the abyss, while the high-frequency band (130-210 kHz) sharpens in on baitfish and game fish with surgical accuracy. Add a fast-response temperature sensor, and you've got the full package for serious anglers chasing canyon runs or seamount trophies.

Why CHIRP Changes Everything for Your Fishing Game

CHIRP isn't just tech jargon—it's a game-changer. Traditional sonar blasts short pulses at fixed frequencies, often missing faint echoes or blending targets into noise. The B265LH, however, unleashes a long-duration pulse sweeping multiple frequencies simultaneously. This floods the water with 10 to 1,000 times more energy, pulling back echoes rich in detail. Paired with Furuno's digital signal processing wizardry, you get:

• 5-10x sharper images of fish arches and bottom contours.
• Effortless baitfish-vs-game-fish separation, even in thick schools.
• Rock-solid bottom tracking at high speeds, no dropouts.
• Superior noise rejection in choppy seas or engine-heavy boats.
• Full coverage of sweet spots like 50 kHz and 200 kHz, plus everything in between across 103 kHz of bandwidth.

Boat captains swear by it for commercial hauls or weekend warriors pushing limits—think tuna tournaments or swordfish hunts where every mark counts.

Key Performance Specs That Deliver Real Results

Built for power users, this 1,000-watt transducer doesn't mess around. Here's what sets it apart:

Ideal for boats 25 feet and up, it pairs seamlessly with Furuno's CHIRP-enabled sounder modules, unlocking broadband potential without compromises.

Installation Insights and Pro Tips

Thru-hull setup rewards planning. Position it forward of props and keels for clean water flow—dead ahead or slightly off centerline works best. The included high-speed fairing minimizes drag and bubbles, keeping readings steady even at 30+ knots. For fiberglass hulls, fair the hole perfectly to avoid leaks; wood hulls might need extra sealing. Pro anglers often deadrise-match the fairing to hull angle for zero turbulence. Once wired (bare leads make it flexible for custom installs), calibrate in calm water for peak performance.

Maintenance is straightforward: Rinse after saltwater use, inspect the face for growth, and store dry in off-seasons. That bronze housing laughs off corrosion, backed by a solid warranty for peace of mind.

Real-World Fishing Wins with the B265LH

From inshore reefs to bluewater canyons, this transducer shines. Low CHIRP mode reveals wrecks and drop-offs where bigeyes lurk; switch to high for pinpointing yellowfin amid sardines. Recreational skippers love how it IDs bottom hardness—sand flats vs. rock piles—for hotspot hunting. Commercial ops track seamounts effortlessly, maximizing every trip. If you're upgrading from narrowband, the resolution jump feels like night to day—fewer false positives, more hookups.