Golf rangefinders such as those made by Bushnell and GolfBuddy are hand-held devices. It requires the user to look through its prism, and it can zoom in on certain areas of the course. A GPS watch only works on mathematical calculations. Those who want the most immersive experience can rely on a rangefinder. But the GPS watch has the advantage of showing the direction and course overview of the game, which a rangefinder can’t. A handheld GPS is closer to a wearable GPS watch than a rangefinder, even if they all feature a shot distance calculator function.