Pay attention. Retrospect will always tell you there were signs that something was about to go wrong. Be on guard when somebody says, "That's strange," like when the engine makes an unusual noise, or when the boat ahead of you going out the inlet is being tossed around like a child's toy. Don't hesitate to hesitate. If possible, slow down, turn around, question, regroup. Pay attention, process the information you have and then act on it.