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In a joint release Tuesday, the R&A and USGA announced their plans to limit the use of green-reading materials beginning in 2019, "reaffirming the need for a player to read greens based on their own judgement, skill and ability."
Starting Tuesday, the proposal detailed below will be subject to a six-week period of "feedback and consultation with interested parties."
The final regulations will then published in an interpretation of Rule 4.3 - the use of equipment - and adopted with the rest of the new Rules of Golf on Jan. 1.
The release did stress that both yardage books and handwritten notes will still be allowed, with the caveat that those handwritten notes "cannot be used to create either a direct copy or a facsimile (replica) of a detailed green map.