It’s an old question, even though the technology has been accessible to the golfing public for only a few years now. Which is better for finding yardages on a golf course: GPS or laser?
Each is a sophisticated technology. The Global Positioning System is an array of satelites that beam precise microwave signals that receivers on Earth can use to establish their location, speed, and direction, as well as the current time. These receivers include golf GPS devices that use those signals to calculate how far the device is from certain pre-programmed coordinates. Laser rangefinders use a beam of light reflected off a target to measure the distance from the device to the target. Pretty cool stuff!