Laser and GPS rangefinders can help you navigate the course, no matter where you play. A GPS rangefinder uses less time to help you determine the distance between points on the course or the hole because they use a set of measurements that comes from course maps. You could pay a monthly subscription fee for these course maps.
A laser rangefinder doesn't need a map of the course to work, but they take more time in assessing the distance. Additionally, the idea behind this to that laser rangefinders are only as accurate as the person using it. So, if the person doesn't work it correctly, the measurements won't be correct.
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