User-friendly, golf-oriented GPS unit for displaying key yardage distances on the course * Calculates instant, precise distances to the front, center, and back of greens, plus hazards; unit holds up to 20 courses with more than 21,800 available * 1.25-by-2.25-inch LCD offers excellent visibility in direct sunlight; waterproof and shockproof * Compatible with Windows Vista, XP, and 2000 and Mac OS X; up to 22 hours of battery life * Includes belt/bag clip, USB-serial cable, and AA batteries; measures 2 x 4.4 x 1.2 inches (W x H x D)