The Garmin Approach G3 is, a rugged, waterproof, touch screen golf GPS device packed with thousands of preloaded golf course maps. The Approach G3 uses a high-sensitivity GPS receiver to measure individual shot distances and show the exact yardage to fairways, hazards and greens. The Approach GP3 is a bit smaller and lighter than the Approach G5, and is ideal if you prefer to walk the course.