Raymarine CPT-S 12° Bronze Transducer – Thru-Hull CHIRP, 900ft Range

The E70340 CPT-S 12° is the sister model to the 20° bronze transducer, aimed at hulls with lesser deadrise (~7° – 17°). With its 12° tilt, this unit compensates for the hull’s moderate V-shape, ensuring the sonar’s beam points straight down on installations where the deadrise is in the mid range. Like the other CPT-S models, it is a single-beam High CHIRP fishfinder transducer with a 25° conical beam optimized for fish targeting and depth. Its operating frequency band (approximately 160–200 kHz) provides an excellent balance of range and resolution, with a maximum reliable depth reading of around 900 feet (274 m). This comfortably covers the needs of navigation (ground avoidance) and recreational fishing in most scenarios.

The bronze housing of the CPT-S 12° has a low-profile, allowing for a flush mount – once installed, the transducer face sits nearly flush with the hull, reducing drag and the chance of snagging flotsam. This design is particularly valued on faster motorboats and on sailboats, where a smooth hull is important for performance. Bronze construction ensures reliability and longevity, even with continuous saltwater exposure. Installation involves drilling a hole in the hull and securing the transducer with a backing nut; professional bedding with a quality marine sealant is recommended to guarantee no leaks. The supported deadrise of 7° to 17° makes this transducer a great choice for many production boats with moderate V-hulls – for example, many offshore fishing boats in the 20–26 ft range have around 12° deadrise at the transducer location, for which this version is perfect. If a hull’s deadrise is about 0–5°, Raymarine offers a 0° bronze model (A80446), and if it’s steeper (15–25°), the 20° version (E70341) is available. By selecting the proper tilt, the CPT-S ensures that the sonar signal’s energy is directed straight down, yielding the best possible echo quality.

Functionally, the CPT-S 12° delivers the same sonar performance as the transom CPT-S: a 25° beamwidth, an integrated temperature sensor, and excellent target separation thanks to CHIRP technology. The differences lie in the mounting method and material – bronze for durability, and thru-hull mounting often provides more stable readings at high speeds since the transducer is always submerged and less prone to aeration compared to a transom-mounted unit.

Compatibility: Like the rest of the CPT-S series, the bronze 12° transducer works directly with Element S and Axiom DV devices. It’s a perfect fit, for instance, for an Element 7S/9S setup on a sailboat or an Axiom 7 DV on a powerboat – delivering instant CHIRP sonar capability without additional modules. For users with Axiom Pro S (e.g., Axiom Pro 9S), the A80490 adapter connects this transducer to their unit, since the Pro S uses a 25-pin connector for 1 kW transducers – via the adapter, the CPT-S can operate on its 300 W high-CHIRP channel (which is exactly what the CPT-S is designed for). When used with an Element HV via the A80559 adapter, the sonar will act as a standard 2D CHIRP source (Element HV can utilize it for deeper traditional readings to complement the HyperVision transducer). The CPT-S is not directly intended for Dragonfly Pro or Wi-Fish (which require CPT-DV/DVS transducers), but the Dragonfly 4/5/7 non-PRO models could, in theory, use the CPT-S via an adapter as a sole CHIRP channel (though this is seldom done, as those units are designed around DownVision). In summary, the CPT-S 12° offers flexibility and can accompany your electronics upgrades over time.

Recommended Use: The CPT-S 12° is an excellent addition for owners of medium-sized boats who want dependable sonar information without unnecessary complexity. It’s often chosen by sport fishermen who desire stable readings while on the move – during trolling or scouting new spots – as the thru-hull transducer stays in the water and maintains the bottom lock even at speed, whereas a transom might occasionally lose contact at high velocity. It’s also suitable for diving and cruising vessels where the primary goal is safe navigation – knowing the precise depth under the keel at all times. Sailboats (up to ~40 ft) that often heel over will appreciate the flush design – it minimizes cavitation noise and does not affect the boat’s drag significantly. The CPT-S 12° is essentially a “install and forget” piece of gear – it requires minimal maintenance (just periodic cleaning of any marine growth) and provides valuable data every time you’re on the water. With a two-year warranty and Raymarine’s build quality, this transducer is a reliable part of your onboard electronics suite.