Northstar Explorer 557 GPS Receiver

the northstar explorer chartplotters :navigation is easy with northstars explorer series dedicated chartplotters a simple-to-use menu structure and superb daylight viewable screen means you can enjoy your voyage whether its across the bay or across an ocean. rugged and waterproof the northstar explorer is a brilliant choice for your navigation needs.ready-to-go ais capability: automatic identification system (ais) is ready-to-go on the 567 and 557 allowing you to identify and avoid large ships and other vessels transmitting ais signals in near by waters.compact yet comprehensivefuel management: every explorer chartplotter unit has a built-in fuel computer. just purchase the optional fuel kit to display fuel management data such as fuel flow fuel remaining estimated range and fuel economy. a graphical fuel gauge complements this digital information and each explorer comes smartcraft -ready - a fantastic feature for boats with compatible mercury mercruiser and mariner engines.explorer 557: the built-in 32 mb re