Automatic Identification System (AIS) is ready-to-go on the 557, allowing you to identify and avoid large ships and other vessels transmitting AIS signals in near by waters. Offers enhanced fuel management options (gasoline and SmartCraft) and is NT+ or NT MAX cartography capable.Features 5" high resolution 640 x 480 pixel screen. VGA color chartplotter with external atenna, cable & mounting brackets, yoke bracket, etc. included (SmartCraft™ enabled) world base map.