For vessels less than 40 ft, what is the fatigue limit at a sea state greater than 4 ft?

• A. 8 hours
• B. 4 hours
• C. 6 hours
• D. 12 hours

Answer: (C)

Fatigue limit is about how long people can stay on duty safely when the boat is moving in rough conditions. When seas are rough, the motion, vibrations, and noise increase physical and mental strain, so the maximum continuous work time must be reduced to keep alertness and performance up.

For small vessels, the recommended limit in seas rougher than a light chop is a middle-ground duration. This choice best balances getting necessary work done with staying safe, since shorter limits would unnecessarily constrain operations, while longer limits would raise the risk of fatigue and mistakes in challenging conditions. If more time is needed, rotate crews, plan tasks for calmer intervals, or seek calmer conditions.