Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 13.7m Cable
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Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 13.7m Cable Product Description
Unlock Precise Speed and Temperature Readings on the Water
Imagine gliding through choppy waters or racing across calm seas with speed data that's spot-on from the moment you pick up momentum. The ST900 Speed and Temperature sensor delivers exactly that, blending cutting-edge paddlewheel technology with a sleek, drag-minimizing design. Perfect for sailors chasing every knot or powerboaters tracking performance metrics, this thru-hull sensor ensures your onboard instruments paint an accurate picture of your vessel's behavior.
What sets it apart? A next-generation paddlewheel that wakes up fast at low speeds—starting as low as 0.3 knots—and stays linear up to 45 knots. No more frustrating delays or erratic jumps in readings. Pair that with rapid-response temperature sensing, and you've got essential data for navigation, fishing hotspots, or optimizing fuel efficiency.
Standout Features for Real-World Boating
- Ultra-Responsive Gen2 Paddlewheel: Captures speed from idle drifts to high-speed runs with unmatched sensitivity, ideal for both sail and power crafts.
- Low-Profile Housing: Projects just 5mm beyond the hull, slashing drag and keeping your boat's lines clean.
- Built-In Valve System: Seals the hull during paddlewheel servicing, cutting down on bilge water and hassle.
- Retractable Design: Easily pull the insert for cleaning without hauling the boat—retrofits seamlessly into popular Airmar housings.
- Analog Output: Integrates smoothly with legacy Raymarine displays and a wide array of marine electronics.
- Rugged Plastic Construction: Tough enough for harsh marine environments yet lightweight for straightforward installs.
Superior Performance That Outpaces the Competition
Traditional paddlewheels often lag at startup or falter at extremes, but the ST900's Gen2 innovation changes the game. It provides smooth, reliable speed logs across the full range, helping you trim sails perfectly or push your outboard to peak efficiency. Temperature readings are equally precise, alerting you to thermoclines for better fishing or engine cooling insights. Boaters report fewer calibrations needed and data that matches GPS logs closely, building trust in every outing.
Effortless Installation and Hull Compatibility
Drill a standard 51mm (2-inch) hole, thread in the housing, and you're set. The low-profile thru-hull mount works on hulls from 8mm thick up to thicker fiberglass setups. Its retractable nature means routine maintenance is a quick topsides job—no divers required. Plus, dropping into existing Airmar P120 or B120 housings makes upgrades painless for those refreshing older systems.
Pro Tips for Long-Lasting Accuracy
- Inspect the paddlewheel monthly; barnacles love it—clean gently with a soft brush and marine-safe solution.
- Calibrate speed against GPS in calm, known conditions for pinpoint setup.
- Secure the 13.7m cable away from heat sources and interference for clean signals.
- Winterize by removing the insert in cold climates to prevent freeze damage.
Technical Specifications at a Glance
| Specification | Details |
|---|---|
| Cable Length | 13.7m |
| Functions | Speed & Temperature |
| Hull Hole Size | 51mm (2") |
| Housing Material | Plastic |
| Mount Type | Low-Profile Thru-Hull |
| Output Protocol | Analog |
| Retractable | Yes |
| Retrofit Compatibility | Airmar P120, B120 Housings |
| Speed Range | 0.3 to 45 knots (0.34 to 52 MPH / 0.55 to 83 KPH) |
| Temp Accuracy | ±0.5°C (±1.8°F) |
| Temp Operating Range | -10°C to 40°C (14°F to 104°F) |
Package Contents
- ST900 sensor with 13.7m cable
- Low-profile plastic housing and mounting nut
Why Boaters Swear by the ST900
In a sea of sensors, this one stands tall for its blend of innovation and reliability. It's not just about numbers—it's about confidence on the water. From coastal cruisers to offshore adventurers, those who install it rave about the crisp low-speed pickup for docking and the steady high-end performance that informs every decision.
Frequently Asked Questions
What speed range does the ST900 sensor cover?
It delivers accurate readings from 0.3 knots up to 45 knots (0.34 to 52 MPH or 0.55 to 83 KPH), making it versatile for slow maneuvers and fast cruising.
Is the ST900 compatible with older Raymarine systems?
Yes, its analog output works seamlessly with legacy Raymarine instruments, and it retrofits into Airmar P120 and B120 housings for easy upgrades.
What size hole is needed for installation?
A standard 51mm (2-inch) hole in the hull is required for the thru-hull mounting.
How accurate is the temperature measurement?
Temperature accuracy is within ±0.5°C (±1.8°F), providing reliable data for water conditions from -10°C to 40°C (14°F to 104°F).
Does the housing allow for easy maintenance?
Absolutely—the retractable insert and built-in valve let you remove the paddlewheel for cleaning without flooding the bilge.
What's the cable length included?
It comes with a 13.7m cable, long enough for most installations from cockpit to thru-hull location.
Is this sensor suitable for both sailboats and powerboats?
Yes, the Gen2 paddlewheel excels in low-speed responsiveness for sailing and maintains accuracy at high speeds for powerboating.
Raymarine ST900 Speed and Temperature Low Profile Plastic Housing
Model: E70673- Speed and fast-response water-temperature
- Best-in-class speed range from 0.3 to 45 knots (.34 to 52 MPH/.55 to 83 KPH)
- Analog output
- Retractable insert in a low-profile plastic housing with a water valve
- ST900—Retrofits into Airmar P120 and B120 housings
Speed performance has been taken to the next level with the introduction of the ST900 Speed/Temperature sensor. Featuring the new Gen2 Paddlewheel, the ST900 out-performs all other paddlewheel sensors for responsive startup and linearity. The Gen2 Paddlewheel begins delivering accurate speed reporting as low as 0.3 knots and maintains smooth speed output through 45 knots.
These low-profile housings are nearly flush and minimize drag with only 5 mm (3/16"") extending outside the hull. The housing has a valve assembly that helps to minimize water ingress in the bilge when the sensor is removed for routine maintenance of the paddlewheel.
Airmar’s new, next-generation paddlewheel design delivers industry-leading performance for start-up responsiveness and linearity throughout the speed range. Gen2 paddlewheel maintains the top speed performance Airmar is known for and adds start-up speed performance that beats all other available paddlewheels. The Gen2 paddlewheel is the most sensitive and accurate paddlewheel available for sailing and power boats.
Specifications| Cable-Length | 13.7m |
| Functions | Speed, Temperature |
| Hole Size | 51 mm (2"") |
| Housing | Plastic |
| Mounting Style | Low Profile Thru-Hull |
| Protocol Output | Analog |
| Retractable housing | Yes |
| Retrofits | AIRMAR P120, B120 housings |
| Speed Range | 0.3 to 45 knots (.34 to 52 MPH/.55 to 83 KPH) |
| Temperature Accuracy | ±0.5°C (±1.8°F) |
| Water Temperature | -10° to 40°C (14° to 104°F) |
What's in the Box:
- ST900 with 13.7m Cable
- Plastic Housing and nut
Save $33 when you buy the Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 13.7m Cable for only $196 from NVN Marine! Same day shipping before 3pm.
Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 13.7m Cable Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Raymarine |
| Weight: |
2.0 lb |
Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 13.7m Cable User Reviews
Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 13.7m Cable Shipping & Return
| Shipping Weight: |
2.0 lb |
|---|---|
| Box Sizes: |
1.00 (h) x 1.00 (w) x 1.00 (l) |
| Cubic Feet: |
1.0 |
| Returnable: |
Yes |
| USPS First Class: |
Yes |
| P65: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.