The D800 utilizes Airmar’s proven Tilted Element™ The ceramic is tilted inside the housing, which compensates for hull deadrise and orients the transducer beam straight down, resulting in strong bottom echo returns and accurate depth readings. The retractable housing with a self-closing valve reduces water flow into the vessel when the transducer is removed for cleaning. The D800 is a low-profile, retractable, thru-hull sensor that computes accurate depth and temperature data and sends it to any NMEA 0183 or NMEA2000® display or network.