In January 2014, The R&A decided to allow the use of distance measuring devices (DMDs) in all of its amateur events in 2014.
For further information on this and other issues relating to distance measuring devices, please click on the following related documents:
Details of the Local Rule
Can I use my distance measuring device?
Understanding the Rules on DMDs
Your Distance Measuring Device Questions Answered
Consideration of Change in Interpretation of Rule 14 3 for Distance-Measuring Devices