CPT-S CHIRP 20° Plastic Thru-Hull Transducer

The CPT-S 20° Plastic Thru-Hull Transducer is the steep-angle specialist in Raymarine’s single-element CHIRP lineup, designed for boats with pronounced V-hulls (approximately 15°–25° deadrise). With its internal 20° tilted element, this transducer can be installed on sharply angled hull bottoms while still pointing the sonar beam straight down. The result is optimal sonar performance—your 25° cone of CHIRP sound waves is directed vertically beneath the boat, even if mounted on a steep deadrise section—ensuring you don’t miss any detail due to hull angle. It’s the ideal solution for deep-V speedboats, offshore center consoles, or any vessel with a significant keel angle that requires a through-hull transducer.

Like other CPT-S models, the 20° variant operates on high-frequency CHIRP, providing excellent resolution and target clarity. It reliably reads depths to about 275 m (900 ft), covering both coastal depths and deeper offshore spots where gamefish lurk. The integrated temperature sensor continuously feeds water temp data to your display, useful for finding temperature breaks or monitoring conditions for diving and fishing. The transducer’s housing is made of rugged urethane plastic, which allows for corrosion-free installation on metal or fiberglass hulls. Its low-profile design means once installed, it creates minimal drag and is safe for trailered boats (no big protrusions on the hull). The included 10 m cable makes it straightforward to run to your helm electronics, even on larger vessels.

Features and benefits:

• 20° Tilt for Steep Hulls: This transducer is purpose-built for vessels with a steep V-hull form – typically found on high-performance powerboats and offshore fishing boats that cut aggressively through waves. The 20° tilt within the transducer accounts for hull angles roughly in the 15–25° range, eliminating the need to craft custom wedges or fairings. This design ensures that even on a deep-V, the sonar beam is oriented directly downward, maximizing echo returns and sonar accuracy.
• Wide Coverage, Clear Detail: Despite being optimized for steep angles, the CPT-S 20° still offers the same 25° beam width and CHIRP clarity as its siblings. This wide cone covers a generous area for scouting fish and structure, which is particularly valuable in deep waters where targets might be dispersed. Thanks to CHIRP processing, the broad coverage doesn’t come at the expense of detail – individual fish targets, bait schools, and bottom structures remain well-defined on your display.
• Deep Water Confidence: The performance of the CPT-S 20° transducer extends to roughly 270+ meters (up to 900 feet), giving you confidence in deep-water scenarios. Whether you’re dropping bait in a bluewater trench or navigating over an underwater canyon, this transducer can keep you informed of the depth and reveal bottom features. The high signal-to-noise ratio of CHIRP means it can pick up returns even at the edges of its range better than traditional single-frequency sounders.
• Seamless System Integration: Raymarine has made sure that all CPT-S transducers are easy to integrate, and the 20° model is no exception. It plugs directly into any Raymarine unit with a 9-pin high CHIRP sonar port (like the Element series). With an optional adapter cable (e.g., A80490), you can also connect it to 25-pin sonar ports on higher-end systems like Axiom Pro or Axiom RVX. This adaptability ensures that as your electronics upgrade or change, you can continue to utilize this transducer, maximizing its value over time.
• Durable and Trailer-Friendly: The plastic construction is not only corrosion-proof but also extremely robust against impact and marine growth. The nearly flush installation means less risk of damage or fouling – a benefit if you frequently trailer your boat or operate in debris-prone waters. Maintenance is as simple as occasional cleaning of the transducer face. There are no metal parts to polish or worry about, and the included mounting hardware is designed for long life in the marine environment.

In summary, the Raymarine CPT-S 20° Plastic Thru-Hull Transducer empowers even deep-V hulled boats with the sharp eyes of CHIRP sonar. It ensures you get straight-down, accurate sonar readings without complicated install workarounds. From chasing pelagics offshore to surveying lake depths, this transducer delivers the depth and detail you need. Trust the CPT-S 20° to help you find fish and navigate with confidence, knowing that your sonar system is optimized for your boat’s hull design and ready to perform in the toughest conditions.