Following a six-week feedback period, the USGA and R&A unveiled a new interpretation of the Rules of Golf and the use of green-reading materials on Monday.
The interpretation limits the size and scale of putting green books and any electronic or digital materials that a player may use to assist with green reading.
“We’re thankful for everyone’s willingness to provide feedback as we worked through the process of identifying a clear interpretation that protects the essential skill of reading a green, while still allowing for information that helps golfers enjoy the game,” said Thomas Pagel, the USGA’s senior managing director of governance.
Players will be allowed to continue to use green-reading books beginning in 2019, but the new interpretation will limit images of greens to a scale of 3/8 inch to 5 yards (1:480), and books can be no larger than 4 1/4 inches by 7 inches (pocket-sized). The interpretation also bans the use of magnification devices beyond normal prescription glasses.
The USGA and R&A will allow for hand-drawn notes in green books as long as those notes are written by the player or their caddie. The rule makers also dropped a proposal that would have limited the minimum slope to four percent in green-reading material.
“These latest modifications provide very practical changes that make the interpretation easier to understand and apply in the field,” Pagel said.