MST I Mooring conditions: wind and current?

• A. Up to 34 kt wind with 1 kt current or less
• B. Up to 34 kt wind with 2 kt current
• C. Up to 30 kt wind with 0.5 kt current
• D. Up to 40 kt wind with 1 kt current

Answer: (A)

Mooring conditions at this level are about keeping loads on the lines and gear within what your standard equipment can safely handle. For MST I, the safe envelope is wind up to 34 knots with current of 1 knot or less. This pairing keeps the dynamic forces on mooring lines, anchors, and bollards within the tested limits, allowing normal crew action and equipment to hold the vessel in position without needing extra gear or assistance. Going beyond those limits—whether the wind is higher, the current is stronger, or both—would push loads past what MST I is designed to support, requiring a higher MST level, additional hardware, or tug support. So the combination of 34 knots of wind and 1 knot or less of current is the best fit for MST I.