Every two years the USGA comes out with "The Rules of Golf" and they have made additions to the 2006-2007 edition including rules governing the use of rangefinders. However I can't seem to find what the actual changes are. I'm aware that Professionals are permitted to use them during practice rounds but what about everyone else? Are there restrictions on when or what kind of rangefinders you can use? Also, if you have extensive knowledge, are they allowed in local tournament/competitive play, or in my case, High School Matches? Any help is greatly appreciated.