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The Northstar Explorer 557 is 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 557 is a brilliant choice for your navigation needs.Ready-to-Go AIS capability: Automatic Identification System (AIS) is ready-to-go on the Northstar Explorer 557, allowing you to identify and avoid large ships and other vessels transmitting AIS signals in near by waters.Compact Yet ComprehensiveFuel Management: The Northstar Explorer 557 GPS 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.Northstar Explorer 557: The built-in 32 MB regional background map still offers reliable entry-level use, waiting to be enhanced with C-Maps latest cartography: NT MAX?. With a 640 x 480 pixel screen, chart display becomes 4 times sharper than the 550, making the 557 very easy on the eye.