Pro golf tournaments have teams of marshalls at every hole. Besides controlling spectator movements, they have a safety function. At last year's Senior PGA Championship, one marshall always stood at the back edge of the tee box with a bright colored flag. After each tee shot...
- If the ball heads down the fairway, you point the flag straight ahead.
- If the ball heads toward the rough/rope line, you point the flag to that side.
- If the ball heads deep into the trees, you wave the flag vigorously toward the trees.
For these wayward shots, the fairway marshalls near the landing area shout a warning to the spectators that a ball is coming in.
MS256 noted that balls are hard to track sometimes. Hopefully, a couple of the spectators can spot the flight and warn their neighbors.