The GPS 72 is a low-cost solution for land or marine navigation designed to provide precise GPS positioning using correction data obtained from the Wide Area Augmentation System (WAAS). The GPS 72 can provide position accuracy to less than three meters when receiving WAAS corrections. This rugged, waterproof, unsinkable GPS receiver offers a large, 4-level grayscale screen. It's designed as the next generation in basic, entry-level Garmin® GPS