Because the speed of light is constant, the GX-I (like all laser rangefinders) determines the distance to an object by timing how long it takes for light to be reflected back to the unit. The functionality is very simple: laser pulses are sent from the unit, bounce off of whatever’s out there to bounce off, and return to the unit. You point it at your target, press or hold a button down, and read the measured distance. The GX-I is a vertically held unit which measures distances in either meters or yards. These rangefinders notably improve upon the venerable PinSeeker 1500 in just about the only ways I think a laser rangefinder can really be improved: by adding features, making it smaller, and shaving a hundred bucks off the asking price. One of the challengers in the laser rangefinder category is longtime rifle scope-maker Leupold (& Stevens) with their GX-I and GX-II laser rangefinders. The market has expanded quickly, and the early guys in – Bushnell with laser rangefinders and SkyGolf with GPS – are being challenged at every turn. Since 2006, they’ve been legal for tournament play under a local rule, and it seems as though every serious golfer has one (or more!) in their bags. In 2005, these types of devices were illegal. What has changed is that three years ago rangefinders and GPS units were a rarity. I started a Bushnell PinSeeker 1500 review in 2005 with the sentence “Tiger Woods has long said that the secret to good golf is always being pin high.” A lot has changed since 2005, but Tiger’s advice still rings true.
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