Is it legal under the Rules of Golf to use a Rangefinder or other Electronic Distance Measuring device?

A. The use of a distance-measuring device is a breach of Rule 14-3, which states that during a stipulated round, the player shall not use any artificial device or unusual equipment for the purpose of gauging or measuring distance or conditions which might affect his play (Rule 14-3). The USGA Handicap System requires players to post scores made when a device which measures distance only has been used (regardless of whether the Committee has adopted the Local Rule described below). Scores made while using a device which measures other conditions which might affect play (e.g., wind speed or the slope of the ground) are not acceptable for Handicapping purposes. Please refer to Section 5-1 of the USGA Handicap System Manual regarding acceptable scores. USGA Handicap Home Page The Committee may, by Local Rule, permit the use of devices that measure distance only (i.e., the device may not be used to measure other conditions such as wind-speed or the slope of the ground). (Rule 14-3 Note ...  more