Fastest HDS ever. Lighting-fast chart updates. Real-time StructureMap? capability for overlaying StructureScan? Sonar Imaging data and maps to create a more life-like underwater view. Super-accurate, internal GPS antenna. Large, 6.4" 480V x 640H full VGA color display. Brilliant, enhanced SolarMAX? PLUS display. Pure-white LED screen/keypad backlighting fully adjusts to zero-dim for night viewing. Built-in, exclusive Insight USA? mapping or Enhanced US basemap model choices.