Tiger Woods has returned to professional golf, though not in the PGA Tour. Since it launched earlier this month, Woods has been taking part in his own TMRW Golf League (TGL), which he founded in partnership with fellow major champion Rory McIlroy.

You can only imagine how the TGL technicians felt when Rory McIlroy walked into his 90-minute practice session last week with two launch monitors from his personal collection. The four-time major champion and TGL co-founder needed to put his concerns to rest before he debuted in the league: Is the simulator used for golf’s new indoor league accurate?