The ST40 Series of Digital Instruments from Raymarine are elegant, versatile, and simple to operate. Three buttons control all the functions in the entire ST40 series. Each instrument in the series offers SeaTalk output for sharing and repeating navigation data with autopilots, GPS, radars, or chart plotters. Extra large 7-segment displays digits and an extremely clear LCD display provide for outstanding visibility in all lighting conditions and is supplemented in low-light conditions with 3 levels of backlighting. Each instrument can be surface or bracket mounted. The attractive gray case is waterproof to USCG-CFR 46 standards and measures 5.0" x 2.8". Two-year warranty.