A golf rangefinder is a laser-based device designed to measure the distance between the golfer and a specific target, such as the flagstick, bunker, or tree. It works by emitting a laser beam that bounces off the target and returns to the device, providing an accurate reading of the distance.
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What is the Difference Between A Golf Rangefinder and A Golf GPS Device? - GOGOGO SPORT VPRO

With a plethora of distance measuring devices (DMDs) now available on the market, you may be asking yourself whether you should buy a Rangefinder or a GPS device. As with any purchase, the answer depends on your budget, your knowledge of technology,