Airmar?s P66 is the best performing and most popular transom-mount, TRIDUCER® Multisensor in the market. Because of its hydrodynamic shape, water coming off the transom flows smoothly under the transducer face. This results in accurate, high-speed, depth and speed readings and clear display images. The plastic release bracket lets the P66 rotate up to protect the housing if struck by an object while underway.