Raymarine P66 TM Depth Transducer f/ST40

Enhance your boating adventures with the reliable depth sensing capabilities of the Raymarine P66 transom mount transducer, designed specifically for seamless integration with ST40 instruments. This compact, durable sensor delivers precise underwater readings, helping you navigate shallow waters, anchor safely, and explore with confidence—whether you're fishing offshore or cruising coastal routes.

Superior Depth Performance Tailored for Everyday Boaters

The P66 stands out with its single-frequency operation at 200 kHz, optimized for clear, accurate depth measurements in a variety of water conditions. Its narrow beam angle ensures focused sound waves that penetrate effectively, reducing clutter from thermoclines or suspended particles. Boaters often praise its responsiveness during high-speed runs, providing real-time data to avoid unexpected shallows without the guesswork.

• Focused Beam for Precision: Captures reliable depths up to practical limits for most recreational vessels.
• Robust Construction: Plastic housing withstands harsh marine environments, resisting corrosion and impact.
• Extended Reach: 30-foot cable offers flexible routing options during installation, minimizing signal loss.

Effortless Compatibility and Versatile Hull Mounting

Perfect for metal, wood, or fiberglass hulls, this transducer mounts securely on the transom of planing boats, delivering plug-and-play simplicity with ST40 displays. Its design accommodates moderate deadrise angles common on popular fishing and family cruisers, ensuring consistent bottom tracking even as your hull lifts at speed.

Installation is straightforward for DIY enthusiasts: Clean the transom surface, apply marine-grade adhesive or through-bolts, and route the cable away from sources of interference like engines or props. Pro tip—position it slightly off-center to avoid turbulence from strakes, and angle it parallel to the waterline at rest for optimal performance.

Real-World Reliability Across Conditions

From choppy bays to calm lakes, the P66 excels where others falter. Its depth-only focus eliminates distractions from speed logs or temperature sensors, keeping your ST40 screen dedicated to the essentials. Users report consistent performance in murky freshwater or saltwater, making it a go-to for anglers tracking bottom structure or sailors monitoring draft in unfamiliar harbors.

Built to endure UV exposure, constant submersion, and vibrations, it maintains calibration over seasons of heavy use. Pair it with your ST40 for a setup that's as tough as your boating lifestyle.

Practical Tips for Long-Lasting Performance

To maximize lifespan, inspect the face regularly for marine growth— a quick wipe with a soft brush and mild cleaner keeps readings sharp. During haul-outs, store it dry and protected. If you're trailering frequently, consider a fairing block to streamline flow and protect against debris strikes.

This transducer isn't just hardware; it's peace of mind on the water, empowering safer, more informed decisions every trip out.