yea thats the original rule but theres a revision to it, which these devices fall under (local rule).....
14-3/0.5 Local Rule Permitting Use of Distance-Measuring Device
Q. May a Committee, by Local Rule, permit the use of distance-measuring devices?
A. Yes. A Committee may establish a Local Rule allowing players to use devices that measure distance only. However, the use of devices that gauge or measure other conditions that might affect a player's play ( e.g., wind or gradient) is not permitted.
In the absence of such a Local Rule, the use of a distance-measuring device would be contrary to Rule 14-3. (New)
http://www.usga.org/playing/rules/bo...ons/dec14.html