The GPS 76 is designed to provide precise GPS positioning using correction data obtained from the Wide Area Augmentation System (WAAS). This unit features a built-in quad helix antenna for superior reception and can provide position accuracy to less than three meters when receiving WAAS corrections. The GPS 76 provides 1 megabyte of internal user memory to be used for storing downloaded Points of Interest data. This 1 megabyte of storage area is preloaded from the factory with worldwide cities (populations greater than 200,000) and nautical navigation aids such as lights, buoys, sound signals and day beacons, and is perfect for downloading points of interest detail from Garmin's line of MapSource CD-ROMs. The GPS 76 is also preloaded with tide data for the United States (unit is only compatible with USA tidal stations). An extra-large display measuring 1.6"W x 2.2"H gives users a clear view of information, while a waterproof case means the GPS 76 will keep working well even if it's been submerged in water. Even more amazing, this unit will actually float if accidentally dropped in the water.