Raymarine i40 Speed Display System w/Thru-Hull Transducer

Imagine gliding across the water with precise insights into your boat's performance at your fingertips. The Raymarine i40 Speed Display System transforms how you navigate by delivering real-time speed through water, voyage logs, and temperature readings on a crisp, easy-to-read screen. Perfect for sailors fine-tuning their hull speed or powerboaters tracking efficiency, this compact powerhouse fits seamlessly into any helm setup.

Precision Speed Data That Keeps You Ahead

Unlike GPS-based speeds affected by currents and leeway, the i40's thru-hull paddlewheel transducer measures true water speed for unmatched accuracy. Watch current speed update instantly, track maximums during bursts, or average out long hauls. Log total distance or reset for each trip, all switchable between knots, MPH, or KPH, with nautical miles, statute miles, or kilometers. Water temp readings help spot thermoclines for better fishing or optimal engine performance.

Built for Everyday Boating Adventures

Its slim profile—barely wider than a smartphone—mounts flush on consoles or brackets, saving precious dash space. Razor-sharp LCD digits glow bright under sunlight or dim with red backlighting for night watches. Three intuitive buttons handle everything: no fumbling with menus mid-maneuver. Low power draw under 0.4 watts means it sips from your 12V system, ideal for extended outings without draining batteries.

Seamless Networking for Smarter Systems

SeaTalk compatibility plugs it into Raymarine autopilots, chartplotters, and multifunction displays effortlessly. Repeat data across screens or feed speed info to your autopilot for automatic trim adjustments. Upgrade-ready for SeaTalk-ng or NMEA 2000, it grows with your setup, whether starting simple or building a full network. Built-in transducer connections cut wiring hassle, letting you focus on the water.

Installation Made Straightforward

Position the thru-hull transducer forward of props and struts, aligned dead ahead for clean water flow. Drill through the hull (use a fairing block for speedier boats), bed with sealant, and route the cable up top. Pair it with the display using plug-and-play SeaTalk cabling. Surface-mount kit included; optional bezels match your boat's style. Pro tip: Fair the transducer bottom flush or slightly recessed to minimize drag and boost readings below 5 knots.

Real-World Reliability on the Water

Boaters rave about its durability in choppy conditions—sealed against spray, it shrugs off salt and UV. For racers, trip logs nail handicap calculations; cruisers log fuel efficiency by tying speed to consumption data from other instruments. Maintenance is minimal: Flush the paddlewheel seasonally with fresh water to prevent marine growth. It's not just gear; it's confidence in every tack or throttle.

Why True Water Speed Matters More Than Ever

GPS tempts with simplicity, but it lies when wind pushes you sideways or tides pull. The i40's paddlewheel cuts through variables, revealing your boat's honest pace. Pair with wind instruments for VMG calculations, or depth sounders for shallow drafts. Versatile for monohulls, multihulls, or RIBs, it elevates situational awareness without complexity.