Furuno B785M Bronze Thru-Hull Chirp Transducer w/High Speed Fairing Block

Discover Superior Underwater Detection with the Furuno B785M

Imagine gliding through open waters with crystal-clear images of the seabed, schools of fish, and underwater structures right on your display. The Furuno B785M Bronze Thru-Hull CHIRP Transducer elevates your boating experience by delivering exceptional sonar performance tailored for serious anglers and navigators. Crafted from durable bronze, this transducer thrives in saltwater environments, resisting corrosion while providing reliable depth and temperature readings up to 900 feet.

What sets the B785M apart is its CHIRP technology operating across 80-130 kHz, which sweeps frequencies to produce sharper, more detailed fish arches and bottom contours compared to traditional fixed-frequency transducers. Paired with the included high-speed fairing block, it minimizes drag on planing hulls, ensuring smooth operation even at higher speeds without compromising signal quality.

Key Performance Advantages for Real-World Boating

Boaters often struggle with transducers that falter in rough seas or fail to separate targets in dense bait balls. The B785M tackles these challenges head-on:

• Wide Beamwidth Coverage: Adjustable from 24° to 16° beamwidth, it scans broader areas at shallower depths and narrows for precision in deeper waters, ideal for coastal fishing or offshore exploration.
• 600-Watt Power Handling: Packs enough punch for reliable returns in varied conditions, from murky bays to clear ocean depths.
• Thru-Hull Versatility: Mounts flush, tilted, or straight thru-hull, adapting to deadrise angles up to 25° for optimal water flow and minimal turbulence.
• Extended Reach: 39-foot cable gives flexibility for routing to your electronics without signal loss.

In practice, this means spotting structure-oriented species like snapper or grouper with ease, or navigating wrecks safely during low-visibility dives.

Installation Insights for Seamless Integration

Getting the B785M up and running doesn't have to be a hassle. Select a mounting location forward of the prop and keel, at least 1/3 of the hull length from the stern, to avoid aeration. The high-speed fairing block aligns the transducer face parallel to the waterline, crucial for high-speed accuracy.

1. Drill a precise 2-inch hole using the included template.
2. Bed the housing in marine sealant for a watertight seal.
3. Secure the fairing and route the 10-pin connector cable cleanly, avoiding sharp bends.

Pro tip: Pair it with compatible multifunction displays supporting medium CHIRP for the best results. Test in calm water post-install to fine-tune deadrise compensation.

Why Bronze Construction Excels in Harsh Marine Conditions

Bronze isn't just tough—it's optimized for immersion in saltwater, where aluminum alternatives might pit or erode. The B785M's housing withstands constant exposure, maintaining acoustic performance year after year. Temperature sensing adds value for tracking thermoclines, helping you find where fish congregate based on water column layers.

Maximize Your Transducer's Lifespan: Maintenance Essentials

Regular care keeps the B785M performing like new. After every trip, rinse with fresh water to flush salt. Inspect the face for marine growth and clean gently with a soft brush—no abrasives. During haul-outs, check O-rings and seals, replacing if worn. In storage, keep dry to prevent biofouling.

Owners report years of trouble-free service with this routine, far outlasting budget options prone to fouling or delamination.