Navigation features Waypoint/icons: 1000 with name and graphic symbol, 10 proximity | Routes: 50 reversible routes with up to 250 points each, plus MOB and TracBack® modes | Tracks: Automatic track log; 20 saved tracks let you retrace your path in both directions | Trip computer: Current speed, average speed, resettable max. speed, trip timer and trip distance | Alarms: Anchor drag, approach and arrival, off-course, proximity waypoint, shallow water and deep waterTables: Built-in celestial tables for best times to fish and hunt, sun and moon rise/set based on date and location | Map datums: More than 100 plus user datum | Position format: Lat/Lon, UTM/UPS, Maidenhead, MGRS, Loran TDs and other grids, including user grid | GPS Performance Receiver: High sensitivity SiRFstarIII™ GPS receiver;