If the player's ball lies on the putting green, interference also occurs if an immovable obstruction on the putting green intervenes on his line of putt.The procedure for taking relief is found in Rule 24-2b(iii);
If the ball lies on the putting green, the player must lift the ball and place it, without penalty, at the nearest point of relief that is not in a hazard. The nearest point of relief may be off the putting green.Note that this is similar to the relief that is available in circumstances where there is casual water on the putting green between where a player’s ball lies on the putting surface and the hole, Rule 25-1b(iii).
Of course, there may be another type of immovable obstruction encountered on a putting green, most commonly wire netting, which has been installed by a greenkeeper to protect a newly renovated area, usually following animal or machinery damage to the putting surface. Very occasionally, on large putting greens, there may be sprinkler heads actually located on the putting surface, in which case the same line of putt relief option would apply.
Distance Measuring Devices
There still seems to be some confusion over the use of distance measuring devices (DMDs), where they are permitted by a Local Rule. Yes, you can now use an iPhone for measuring distances only, as the ban on taking a compass on the course was removed in January 2014. The USGA has a very useful infographic on the subject at this link.
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