Own the Green - The #1 Book in Golf - Since 2007 - Trusted by professional Tour players & caddies, NCAA coaches & teams, top ranked junior players, competitive amateurs, state golf associations, and tournament directors everywhere. - Precise: Our team has traveled the world surveying golf courses with the most advanced 3D laser scanners. - Every Shot Matters: Our topographic maps of the green surface offer a level of detail not available anywhere else for the most accurate green reading Fully USGA and R&A Legal for Tournament play