AdvanSea Speed S400. Display Only. Log-Speedo with Giant Digits (45mm). Delivers all speed, distance, time and temperature data, together with countdown function. The advanSea S400 series uses cutting edge technology to provide accruate data for cruisers or racers. Accuracy, optimal legibility, flexibility and ease of installation are the key benefits of the S400 series, together with easy intuitive operation with direct function access. LCD screens with wide-angle viewing and super size digits for unmatched visibility. Watertight display facia (IP66); displays feature an anti-fogging coating for optimal saftey even in extreme conditions. The S400 series is available with a choice of compatible transducers manufactured by Airmar or Plastimo. The instruments can also operate as "stand alone" with intelligent transducers or an NMEA0183 source. The advanSea depth, speed and multi instruments are fully compatible replacements for the Navman 3100 and Northstar 310 series, as the same transducers can be used.