RadarGolf has laucnhed a "Ball Positioning System" which enables golfers to track their golf balls with and LCD gizmo. Save your golf balls, reduce your frustration, reduce your penalty strokes. I would have always expected golf ball positioning to be the next big thing, but would have expected the price to be much higher. The system is $250, and a dozen balls are just $40.
Each ball emits a radio frequency signal which can be picked up by the handheld radar when you get close to your ball.