Looks like the PGA is headed toward outlawing green reading books as are available from Strakaline and maybe other companies.
I believe this is good for the game and may speed up play, but I hope this will not force green reading book makers out of business. Why? Because I'd like to see APCD developers have them available to make the greens of REAL courses as accurate as possible. I used them on PGA National and it's a good feeling to know you're putting "the real thing"