Raymarine i50 Speed System with ST900/P120 Retractable Thru-Hull - Professional Marine Speed & Temperature Monitoring
Experience precision speed monitoring with the Raymarine i50 Speed System - a complete marine instrument package featuring the advanced ST900 transducer with Gen2 Paddlewheel technology and P120 retractable thru-hull housing. Engineered for professional mariners who demand accuracy and reliability in all conditions, this system delivers exceptional performance from 0.3 to 45 knots with superior low-speed sensitivity and maintaining smooth output throughout the entire speed range.
The i50's oversized digits and extra-sharp LCD display with red backlighting ensure clear visibility day or night, while the ST900's revolutionary Gen2 Paddlewheel technology provides the most responsive startup and linear performance of any paddlewheel sensor on the market. Perfect for RIBs, powerboats, and small to medium yachts requiring professional-grade speed and temperature data.
Key Benefits & Performance Advantages
- Superior Speed Accuracy: Gen2 Paddlewheel technology delivers precise readings from 0.3-45 knots with exceptional low-speed sensitivity
- Enhanced Visibility: Oversized digits with red backlighting and extra-sharp LCD for optimal viewing in all lighting conditions
- Retractable Design: P120 housing allows easy maintenance without hauling - valve assembly minimizes water ingress during service
- Low Profile Installation: Only 5mm (3/16") extends outside hull, minimizing drag while maintaining accuracy
- Universal Network Compatibility: SeaTalkNG, NMEA2000, and legacy SeaTalk integration for seamless system integration
- Dual Configuration Options: Functions as Master display with transducer or Repeater showing networked data
Technical Specifications
Display Specifications
- Dimensions: 110 x 115 x 44mm (4.22" x 4.52" x 1.7")
- Display Type: LCD with oversized digits
- Backlighting: Red LED for night visibility
- Waterproof Rating: IPX6
- Operating Temperature: -20°C to +55°C (-13°F to 131°F)
- Storage Temperature: -30°C to +70°C (-22°F to 158°F)
Power & Connectivity
- Operating Voltage: 10-16V DC (12V nominal)
- Power Consumption: <1W display only, 2.4W max with transducer
- Current Draw: 45-65mA display / 200mA max with transducer
- NMEA 2000 LEN: 4
- Network Connections: 2 x SeaTalkNG (SeaTalk compliant)
- Transducer Interface: Built-in speed/temperature interface
ST900/P120 Transducer Performance
- Speed Range: 0.3 to 45 knots (exceptional accuracy)
- Sensor Technology: Gen2 Paddlewheel for superior responsiveness
- Housing Material: Low-profile plastic (fiberglass/metal hull compatible)
- Installation Type: Retractable thru-hull with valve assembly
- Hull Protrusion: Only 5mm (3/16") minimal drag design
- Functions: Speed through water, Speed over ground (GPS required), Water temperature
Comprehensive Data Display Capabilities
- Speed Monitoring: Speed through water and speed over ground (GPS input required)
- Temperature Reading: Accurate sea surface temperature measurement
- Trip & Log Data: Comprehensive voyage tracking and distance logging
- Data Networking: Share information across compatible Raymarine instruments
- Autopilot Integration: Full compatibility with Raymarine autopilot systems
Installation & Maintenance Features
- Front-Mount Design: Simple installation with included mounting hardware
- Dual Mounting Options: Surface mount standard or optional trunnion mount kit
- Universal Bezels: Includes bezels for i70s/p70s/p70Rs/eS Series and legacy a/c/e Series
- Retractable Maintenance: Service paddlewheel without hauling vessel
- Retrofittable Design: ST900 core compatible with existing Airmar P120/B120 housings
- Network Ready: Plug-and-play SeaTalkNG with NMEA2000 adaptability
Complete System Package Includes
i50 Display Unit
- i50 Instrument display with built-in speed/temperature interface
- Suncover and front bezel (i70s/p70s/p70Rs/eS Series compatible)
- Suncover and front bezel (a/c/e Series compatible)
- Installation gasket and mounting screws (4)
ST900/P120 Transducer System
- ST900 Speed/Temperature transducer with Gen2 Paddlewheel
- P120 retractable thru-hull housing with valve assembly
- 400mm (15.7") SeaTalkNG spur cable
- SeaTalkNG blanking plug
Support Materials
- Complete installation and operation documentation
- Network configuration guides
- Maintenance procedures manual
Ideal Marine Applications
- Recreational Powerboats: Precise speed monitoring for fuel efficiency and performance optimization
- RIBs & Tenders: Compact design perfect for space-constrained installations
- Small to Medium Yachts: Professional-grade instrumentation with autopilot integration
- Fishing Vessels: Critical speed and temperature data for effective fishing operations
- Commercial Craft: Reliable performance monitoring for operational efficiency
Marine Safety & Standards Compliance
The Raymarine i50 Speed System meets rigorous marine environmental standards with IPX6 waterproof rating and operates reliably in temperatures from -20°C to +55°C. The system's NMEA2000 compliance ensures compatibility with other certified marine electronics, while the low power consumption design reduces electrical system load. The retractable transducer design enhances vessel safety by allowing maintenance without compromising hull integrity.
Frequently Asked Questions
What makes the Gen2 Paddlewheel technology superior to standard paddlewheels?
The Gen2 Paddlewheel in the ST900 transducer provides exceptional low-speed sensitivity starting at 0.3 knots and maintains linear accuracy through 45 knots. It offers superior startup responsiveness compared to traditional paddlewheel sensors, delivering more accurate and consistent speed readings across all operating conditions.
Can I retrofit the ST900 transducer into my existing Airmar housing?
Yes, the ST900 transducer core is designed to retrofit into existing Airmar P120 and B120 housings, making upgrades convenient without requiring new through-hull installations.
How does the retractable design work for maintenance?
The P120 housing features a valve assembly that allows you to retract the paddlewheel sensor for cleaning and maintenance without haul-out. The valve minimizes water ingress into the bilge during service procedures.
Is this system compatible with my existing Raymarine network?
The i50 Speed System is compatible with SeaTalkNG, NMEA2000, and legacy SeaTalk networks. It can function as either a Master display with its own transducer or as a Repeater displaying data from other network sources.
What's the difference between speed through water and speed over ground?
Speed through water measures your vessel's movement relative to the water (affected by current), while speed over ground measures actual progress relative to the earth's surface (requires GPS input). The i50 can display both when properly networked.
How much does the P120 housing extend below the hull?
The low-profile P120 housing extends only 5mm (3/16 inch) below the hull surface, minimizing drag while maintaining accurate speed measurement. This design reduces impact on vessel performance compared to traditional through-hull transducers.
Can the i50 integrate with autopilot systems?
Yes, the i50 Speed System is designed to fully integrate with Raymarine autopilot systems, providing essential speed data for autopilot performance optimization and navigation functions.
What hull materials are compatible with the P120 housing?
The plastic P120 housing is compatible with both fiberglass and metal hulls. The design accommodates various hull thicknesses and materials commonly used in recreational and commercial vessels.