MST III Heavy Weather Mooring (HWM) conditions specify wind up to?

• A. Up to 90 kt wind with 2 kt broadside current or less
• B. Up to 60 kt wind with 2 kt broadside current
• C. Up to 100 kt wind with 2 kt current
• D. Up to 75 kt wind with 3 kt current

Answer: (A)

Heavy Weather Mooring defines the environmental limits under which the ship can remain on station with the assigned mooring configuration. The rule tested here is the wind and current threshold that still allow HWM to be used safely. The official limit is wind up to 90 knots with a broadside current of 2 knots or less. This combination keeps the loads on mooring lines within what the system was designed to handle and maintains control and safety.

Other options don’t fit because they either lower the wind limit below what HWM allows (too small), push the wind limit beyond what is authorized (too large), or require a current component beyond the allowed 2 knots broadside (too high).