Simrad ST850 Speed/Temp Plastic Transducer

Enhance your boat's navigation with precise speed and water temperature readings using this reliable thru-hull sensor. Crafted for seamless integration into marine setups, it delivers analog signals that pair effortlessly with compatible depth sounders, giving you real-time data to optimize your voyages. Whether you're tracking boat speed during a fishing trip or monitoring water temps for better lure selection, this sensor stands out for its durable plastic housing that withstands harsh marine environments without compromising performance.

Why Boaters Trust This Speed and Temperature Sensor

In the world of marine electronics, accuracy matters most when conditions turn choppy. This passive sensor provides consistent speed-through-water measurements unaffected by hull slime or currents, helping you maintain optimal trim and fuel efficiency. Its temperature probe offers quick response times, ideal for spotting thermoclines that fish love to hide in. Unlike paddlewheel designs that foul easily, this model minimizes drag and maintenance, making it a favorite among weekend warriors and serious offshore anglers alike.

Standout Performance in Real-World Conditions

• Robust plastic construction resists corrosion and impact from debris.
• Compact thru-hull design for easy retrofits on fiberglass hulls.
• Analog output ensures broad compatibility with legacy Simrad systems.
• Short pigtail cable simplifies clean installations with minimal splicing.

Perfect Pairing for Depth-Enhanced Systems

Engineered specifically to complement popular plastic thru-hull depth transducers, this speed/temp add-on creates a unified sensing solution. Mount them side-by-side for streamlined data feeds to your chartplotter or fishfinder. Boaters report sharper log readings post-install, especially in shallow bays where precise speed control prevents groundings. It's a smart upgrade for vessels already running Simrad networks, unlocking layered insights without overhauling your entire setup.

Installation Insights from Seasoned Captains

Fitting this sensor into your hull demands care to ensure peak accuracy. Select a flat spot forward of the prop, away from strays or aerated water. Use marine sealant liberally around the thru-hull fitting, and angle it slightly downward for full submersion at rest. Calibrate post-install by running known distances—many users dial it in during a sea trial for spot-on knots-per-hour readings. Pro tip: Pair with an anti-fouling paint touch-up annually to keep speed logs crisp.

Common Pitfalls to Avoid

Steer clear of mounting near transducers that could interfere electrically. Test continuity on the 5-pin connector before sealing it up, and always bed the nut hand-tight plus a quarter turn to prevent leaks. This approach has saved countless outings from soggy bilges.

Boosting Your On-Water Experience

Imagine dialing in your troll speed for stripers or pushing hull speed on a race course with confidence. This sensor feeds critical data to multifunction displays, enabling auto-pilot adjustments and trip logging. Cruisers appreciate the temp alerts for engine cooling checks, while racers leverage speed trends for tactical edges. Its low-profile design slips through tight marina slips without snags, proving its everyday reliability from dock to horizon.

Long-Term Reliability and Care

Built to endure saltwater punishment, this transducer thrives with basic upkeep. Rinse after every saltwater dunk, inspect the impeller seasonally for wear, and store dry during layups. Owners who've skipped antifouling report 20% speed under-reading from growth— a quick silicone spray keeps it gliding smooth. Over years, it holds calibration better than cup-style competitors, delivering ROI through fewer replacements.