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Optical rangefinders are common alternatives to a golf GPS device and offer their own advantages on the golf course. They do not require course downloads in order to work, nor do they rely on satellite signals in order to function properly.
Optical range finders work by pointing them at a designated area and then using lasers to bounce a signal off the target and back to the handset to work out the distance. It’s a great way to navigate distances from bunkers and flags.
Other benefits include the function to measure the change in elevation or other unavoidable scenarios which could upset your shot such as changes in temperature. It’s worth noting that some optical rangefinders will not perform at their best when the weather is foggy, so best to use them when the sky is clear if you want to get the best out of them.