Operators Operator Alert! Critical checkpoint/potential hazard. When you see the above it means you should pay particular attention. We use the Operator Alert to point out various checkpoints, hidden hazards, unusal circumstances or oversights, things that may need your special attention. Things you may not have thought of that could cause a crane related accident. Visit and become a participant in our Crane Talk Bulletin Board (BB) Operator Training Schools Page Here's something most young operators and trainees have never seen or heard of. Take a look at this Animated Gin Pole Lift