B744V Depth/Speed/Temp Bronze Thru-Hull Transducer (600W Tri-ducer)

The B744V is a well-proven thru-hull transducer Tri-ducer multisensor that provides three critical measurements – depth, speed, and temperature – all in one integrated unit. It’s engineered to meet the needs of serious boaters and anglers who demand reliability and precision from their instruments. With a power rating of 600W and dual-frequency operation at 50 kHz and 200 kHz, the B744V is ideal for all of Raymarine’s 600W sonar systems (including built-in sounders on Axiom Pro displays and standalone modules like the CP370 and earlier DSM units). At 200 kHz, the B744V produces a narrow cone (~11° beam) that yields detailed images and excellent target separation in shallower waters, while at 50 kHz it offers a wider ~45° beam for reaching deeper waters and maintaining bottom lock when offshore. The maximum effective depth is approximately 700 ft (213 m) on 200 kHz and 1,200 ft (366 m) on 50 kHz, covering the vast majority of coastal and many blue-water fishing depths.

One of the hallmark features of the B744V is its intelligent and safety-focused mounting design. It incorporates a patented self-closing valve assembly in the thru-hull housing that prevents water ingress when the internal sensor insert is removed for cleaning or storage. This means you can pull the transducer’s insert out (for removing marine growth or checking the paddlewheel) without a geyser of water entering the boat – the built-in valve significantly reduces the flow, giving you the time to service the unit safely.

The B744V comes with a custom high-performance fairing block, which is cut to match your hull’s deadrise angle (up to 24°) and allows the transducer to be mounted with its beam pointing straight down. The fairing ensures the transducer face is correctly oriented vertically, which is critical for accurate sonar readings. When properly installed with the fairing, the B744V results in a very streamlined installation. In fact, at speeds above 30 knots (34 MPH), this transducer can still produce clear images and solid bottom tracking. The hydrodynamic shape of the fairing block reduces drag and minimizes turbulence around the transducer, maintaining a smooth flow of water to the sensor at planing speeds.

The transducer itself features a rugged bronze housing, making it ideal for fiberglass or wooden hulls. (For aluminum or steel hulls, a plastic or stainless steel version is recommended to avoid galvanic corrosion.) The standard B744V fits hull thicknesses up to about 1″ (26 mm); there’s also a long-stem version (B744VL) with an extra 2.5″ of length for thicker hulls, and both versions can be paired with the appropriate fairing block. The B744V comes with a 33 ft (10 m) cable, typically terminated with the connector matching Raymarine’s sounder input (e.g., 7-pin or 8-pin depending on the A66090 kit).

In summary, the B744V offers extremely accurate and reliable data for depth, speed, and temperature from a single through-hull installation. This simplifies your boat’s sensor setup – one hole in the hull provides three types of information. You’ll benefit from confident navigation (thanks to precise depth readings and a quick-response temperature sensor for detecting water temp changes) and comprehensive trolling/fishing data (with speed through water for proper lure presentation and consistent depth tracking). The B744V is the gold standard transducer for many captains who insist on the best performance from their electronics, making it a trusted choice for both cruising and sportfishing vessels.