Raymarine Speed Tranducer - Long Body thru hull Retractable

The Raymarine Speed Transducer – Long Body Through Hull Retractable (Model T911) is a precision marine speed measurement instrument designed for reliable water speed data on vessels equipped with Raymarine speedometer and depth systems. This through-hull transducer has been the standard component included with Raymarine's i100 and T100 speed and depth systems since August 2004, replacing the earlier T904 shorty model. Engineered for hulls up to 2.125 inches thick, it delivers accurate speed readings essential for navigation, performance monitoring, and fuel efficiency tracking on fishing vessels, cruisers, and offshore boats.

The T911 features a 2-inch diameter body with a fitted flap valve that minimizes water ingress when the transducer is removed for routine cleaning and maintenance—a practical consideration for saltwater boaters who must regularly service through-hull fittings. The integrated temperature sensor provides supplemental water temperature data, valuable for anglers tracking thermal layers and for navigation in varying climate conditions. The transducer ships with 6 meters of cable, offering sufficient length for most installation configurations without requiring field-spliced extensions. The retractable design allows for quick removal and reinstallation without haul-out, reducing downtime and service costs.

This transducer is ideal for recreational and serious fishing applications where consistent speed feedback improves trolling control, enables precise drift monitoring, and helps optimize fuel consumption during long offshore runs. Weekend anglers benefit from accurate speed calibration; professional captains and charter operations rely on the T911 for repeatable performance across multiple seasons. Compatibility with Raymarine i100 and T100 systems—two of the marine electronics industry's most widely installed speed and depth platforms—makes the T911 a direct replacement for maintenance or system upgrades.

Through-hull speed transducers remain the standard for marine speedometer systems because they measure actual water flow with minimal electronic error, outperforming GPS-derived speed for precision trolling and drift control. The Raymarine T911's long-body profile accommodates standard hull thicknesses on production fiberglass vessels, and the flap valve design has proven effective in reducing marine growth and saltwater corrosion issues common to through-hull installations. For boaters maintaining existing Raymarine systems or upgrading to a proven OEM component, the T911 delivers decades of field-tested reliability.