MAMARONECK, N.Y. — Standing on the 14th tee at Winged Foot (West) Golf Club, USGA CEO Mike Whan pulled his iPhone out of his back pocket and thumbed his score from the previous hole into the GHIN app, a bogey on the 194-yard par-3. “I’m going to have to break this habit,” he says, nodding toward his phone. “I’m headed to Pebble next week.”  You can use your phone on the course at Pebble Beach Golf Links, but not at the other area courses Whan was visiting (I’ll leave where to your imagination). Nevertheless, his usage of the beta version of the new GHIN app was prolific on this day at Winged Foot and, as it turned out, quite useful for all of us. “It’s a full 255 to carry that bunker,” Whan says on the par-4, 4th, using his finger to move the GPS landing zone on the GHIN course map and then pointing to a classic Tillinghast fairway bunker on the left. “You can carry that,” Golf Digest senior writer Alex Myers says confidently. “Maybe you can," Whan laughs.…