Raymarine P66 Transom Mount Triducer, For ST40, 200kHz, 10m Cable

Overview

The Raymarine E26028-PZ is a P66 transom mount triducer for Raymarine instrument systems, giving the helm depth, boat speed, and water temperature data from one stern-mounted sensor.

This unit is made for boats where a transom installation is preferred, especially outboard and I/O powerboats. The P66 housing uses a rounded, hydrodynamic shape to keep water flow cleaner across the transducer face, which helps maintain more useful readings while the boat is moving.

The integrated 30 ft (10 m) cable gives enough reach for many console and cockpit instrument layouts without adding an extension immediately. It connects to compatible Raymarine instrument setups that use analog depth, speed, and temperature inputs, including Raymarine i40 Bidata, i50 Tridata, iTC-5, and similar systems.

Key features

• Measures depth, speed, and water temperature from a single transom mount sensor.
• P66 transom mount format suits many outboard and I/O powerboats where through-hull installation is not preferred.
• Rounded housing helps water pass smoothly under the transducer face for steadier depth and speed readings underway.
• Recessed water-flow channel helps protect the paddlewheel from floating debris and minor obstructions.
• Plastic release bracket helps protect the transducer if it is struck while mounted on the transom.
• Tool-free removal allows the unit to be taken off for cleaning, service, or storage.
• 30 ft (10 m) cable supports practical routing from the stern to many helm or instrument locations.
• ISO spade connectors support interfacing with compatible Raymarine instrument systems.

Compatibility and fit

This transducer is intended for Raymarine instrument systems that accept analog depth, speed, and temperature signals. It is commonly matched with Raymarine i40 Bidata, i50 Tridata, iTC-5, and similar instrument installations, and it is also associated with ST40, ST60+, ST290, and ST70 instrument configurations when the required interface hardware is present.

For ST70 installations, a compatible depth pod or interface may be required. Before ordering, it is worth checking the display head, pod, or converter already on the boat so the wiring and signal type match the existing system.

Installation and setup

The P66 mounts on the transom, so placement matters. It should sit in clean water flow, away from heavy turbulence caused by strakes, steps, through-hull fittings, prop wash, or trailer bunks. On planing hulls, careful height and angle adjustment helps the face stay wet and aligned while the boat is running.

The 30 ft (10 m) cable should be routed with protection from sharp edges, moving gear, and high-current wiring where possible. Leave enough service loop near the stern for tilt, adjustment, and removal, especially on boats that are trailered or stored with the transducer exposed.

Use cases on board

This triducer is a practical match for owners refreshing a Raymarine instrument package, replacing a damaged P66-style transom sensor, or adding combined depth, speed, and temperature data without cutting a new through-hull opening.

It is especially useful on small to mid-size powerboats where the helm display needs basic navigation and water-condition data for coastal cruising, fishing, and day trips.

Maintenance and care

Keep the paddlewheel and sensor face clean so growth, grit, or paint buildup does not interfere with speed and depth readings. The tool-free removal feature makes seasonal cleaning and storage easier, which is helpful for trailered boats and vessels kept in areas with heavy marine growth.