3 Bays White GSA Zone Swing Analyzer with Advanced Motion Sensor to Improve Game. Every golfer wants to shoot lower scores. But evolving your game takes more than just practice. It takes practicing right. 3Bays uses advanced motion sensors to digitize every element of your swing, then instantly delivers 3D playback to improve every aspect of your game. 3Bays� 9 axis putting sensor captures even the most subtle movement so you can uncover the science behind your stroke and sink more putts.