The GPSMAP-496 has all the great features of the GPSMAP-396 described in detail below plus the most-asked-for new features including, a full internal U.S. Automotive City detail and highway database, over 600 detailed airport ground and taxiway diagrams, all U.S. private airports, and the complete A.O.P.A. Airport directory. The display update rate has been increased to 5 times/sec, which provides super smooth, virtually instant display response. Best of all the GPSMAP- 496 now offers a super hi-resolution terrain feature.