Enhance Your Boating Experience with Precise Speed and Water Temperature Data

Navigating open waters demands accurate information to make smart decisions, whether you're chasing fish, plotting a course, or simply enjoying a day out. This retractable thru-hull speed and temperature sensor delivers real-time speed through water measurements alongside water temperature readings, helping you optimize your boat's performance and stay aware of changing conditions. Designed for recreational boaters and light commercial users, it stands out with its low-profile plastic construction that minimizes drag while providing dependable data to your Raymarine instrument displays.

Unlike paddlewheel sensors that can foul easily with marine growth, this model's retractable design lets you lift the paddle inside the hull for cleaning or when trailering your boat. It's crafted from durable plastic, often referred to as Lexan-grade material in marine circles, offering resistance to impact and corrosion without the weight or conductivity issues of bronze alternatives.

Key Advantages Tailored for Serious Boaters

• Low-Profile Design: Sits flush against the hull to reduce turbulence and improve boat handling at speed.
• Retractable Mechanism: Easily pull the sensor up through a 2-inch hole, protecting it from damage during beaching, maintenance, or storage.
• Dual Functionality: Tracks boat speed accurately in currents and logs water temperature for fishing hotspots or engine cooling insights.
• Extended Reach: Comes with a generous 65-foot cable, ideal for routing to helm stations without signal loss.
• Proven Durability: Engineered to withstand harsh saltwater exposure, UV rays, and constant vibration for years of reliable service.

Boaters report noticeable improvements in speed log accuracy compared to older flush-mount options, especially in choppy seas where traditional sensors struggle. Pair it with your existing setup for log trips, true wind calculations, or performance monitoring.

Perfect Fit for Popular Raymarine Instrument Series

This sensor integrates smoothly with legacy Raymarine displays, ensuring you get the most from your ST-series instruments. It's a direct match for models in the ST60+, ST290, and ST40 lines, providing plug-and-play simplicity with standard spade connectors. For ST70 users, a compatible speed pod unlocks full functionality, keeping your cockpit display crisp and informative.

Whether upgrading from a worn-out sensor or outfitting a new build, it supports essential data like speed over ground adjustments when networked with GPS, giving you a complete picture of your vessel's behavior.

Straightforward Installation on Common Hull Types

Best suited for aluminum and fiberglass hulls, installation involves drilling a precise 2-inch hole below the waterline, typically forward of the propeller to avoid aeration. The thru-hull mount secures firmly, and the low-profile shape hugs the hull contour for optimal water flow over the paddlewheel. Seal it properly with marine-grade compounds to prevent leaks, and route the cable thoughtfully to avoid chafe points.

Deadrise angles up to 20 degrees work well, making it versatile for planing hulls like center consoles or sportfishers. Professional installers appreciate the retractable feature, which simplifies hull penetration checks without hauling out.

Reliable Performance in Real-World Conditions

In testing across diverse environments—from coastal inlets to offshore runs—this sensor maintains calibration even with biofouling buildup, thanks to its smooth paddle and accessible retraction. Temperature readings prove invaluable for targeting species that prefer specific thermal layers or monitoring for hypothermia risks during extended outings. Speed data helps trim your boat efficiently, saving fuel and boosting safety in traffic.

Raymarine's engineering shines here: rugged internals shrug off temperature swings from ice-cold northern waters to tropical bays, ensuring consistent output to your instruments.

Effortless Maintenance for Peak Operation

Keep it performing like new with routine checks. Retract the paddle periodically to wipe away growth using a soft brush and freshwater—no harsh chemicals needed. Inspect the O-rings for wear during annual servicing, and test calibration by running known distances. This proactive approach extends service life, often surpassing competitors in longevity.