Raymarine P66 TM Depth Transducer f/ST40

The Raymarine P66 TM Depth Transducer for ST40 is a reliable depth-sensing instrument designed for anglers and boaters who demand accurate sonar readings on the water. This transducer delivers real-time bottom tracking and water column data to your ST40 instrument display, helping you locate structure, thermoclines, and fish-holding zones with precision. Whether you're navigating unfamiliar depths, monitoring your drift over productive grounds, or simply maintaining situational awareness of underwater terrain, this transducer bridges the gap between your helm station and the underwater world beneath your hull.

The P66 TM employs proven ceramic transducer technology to translate acoustic pulses into stable depth readings across a wide range of water conditions. Its 30-foot cable (10 meters) provides flexible installation options for both retrofit and new-build applications, allowing proper transducer placement away from hull turbulence and engine noise that can degrade signal quality. The unit is engineered for compatibility with metal, wood, and fiberglass hull materials—the three most common boat constructions—making it a universally adaptable choice for retrofit projects or original equipment installations on virtually any cruising or fishing vessel.

This depth-only transducer is ideal for boaters running ST40 instrument systems who need straightforward, no-frills depth monitoring without integrated fish-finding features. Installation requires a clean, through-hull mounting location where the transducer face can maintain full water contact; proper placement—typically on the centerline or slightly offset to avoid prop wash—ensures consistent readings across all speeds and sea states. The Raymarine P66 TM pairs seamlessly with your existing ST40 display infrastructure, delivering the same industrial-grade reliability that professional mariners and serious recreational anglers have trusted for decades.