In 2003 the PGA started using the laser based ShotLink system to measure the length of shots.
Shots like Carl Cooper's 787 yard (719 metres) drive at the 1992 Texas open, which bounced along a concrete path, don’t officially count.
Dustin Johnson also holds an unofficial longest drive record. At the 2018 WGC-Dell Technologies Match Play hit a 489 yard (447 metres) drive. But unfortunately for him stats for match play events are unofficial and don’t count towards historic rankings.
The 498 yard (455 metres) drive Tiger Woods hit at the 2002 Mercedes Championship also did not count because the PGA since revised their figures and have removed 27 drives from that particular tournament.
Another unofficial longest drive happened on the 25th of September 1974. Mike Austin smashed a 515-yard (470 metres) drive on a 450 yard par-4 using a steel-shafted, 43.5-inch persimmon driver and balata ball playing in the US National Seniors Open Championship at Desert Rose Resort, Las Vegas.
Updated: 13-Apr-2022 | Email feedback to this question