Built-in base map with coastlines, rivers, lakes, political boundaries, tide data for the U.S., cities and interstates. GPSMAP 2006 boasts a big 6.4" diagonal display. The GPSMAP 2010 features a giant 10.4" diagonal display. Both units have high resolution pictures due to a pixel count of 640x480. The displays are high contrast, which means they are easy to read in all lighting conditions. 3000 waypoints/icons with name, symbol and comment, with support for proximity waypoints. 50 reversible routes with up to 50 points each, plus MOB and TracBack modes. 5000 point automatic track log. Alarms include anchor drag, arrival, off course, shallow water proximity waypoint, deep water, clock and battery. Built-in celestial tables with sun and moon rise, set and location. Tide tables for the U.S.. WAAS enabled, 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites to compute and update your position.