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 Comprehensive Fuel 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. The Explorer 567 : offers the ultimate in dedicated Northstar Chartplotters - a full 6.4" VGA ultra-bright screen for critical detail close to shore. The 567 offers enhanced AIS and fuel management capabilities as well as the opportunity to add fantastic NT MAX ™ cartography from C-Map. Northstars ease-of-use philosophy is lead by the Explorer 567s user interface design. The intuitive MENU key uses situation logic to display options dependent on the current situation. Have you just set a waypoint? Then the first menu option is GOTO. Currently following a route? The menu displays CANCEL ROUTE. Here at Northstar we call it the "Smart Key" because it knows what you are doing and offers the logical choice for all situations. Match this unit with the Explorer 467 for a big twin screen chart / fish set-up.