12 parallel-channel receiver with a database of American cities and nautical navigation aids such as lights, buoys, sound signals, day beacons and tide data. Built-in memory of one megabyte. Compatible with Garmin's MapSource Points of Interest CD. With this CD, you can look up restaurants, hotels, parks, campgrounds, automotive services, and marinas. Compatible with the Wide Area Augmentation System (WAAS), a technology designed to improve the accuracy of GPS positioning to about 3 meters. Housed in a waterproof case that's about 4" high and 5" wide. A large 4" diagonal, high-contrast display features 100x160 pixels. A simple keypad at the bottom of the unit makes entering information easy, without blocking your view of the display.