This was a FB post by Mark Crossfield saying 17 at Torrey Pines South was actually 20 18 yards shorter than what the announcers said. I guess you could see on tv where they're teeing it up, and then extrapolate yourself via Google maps. But I'm sure there is an or will be an easier way.
I always thought announcers in some instances work up the yardage distances, if this is so, how often? Lets say it does happen and we eventually get the ability to measure ourselves or from some independent unbiased source the actual distances. Wonder how that would change announcing.