Securing a vessel to a berth, buoy, or anchor using lines, chains, or anchors to keep it stationary.
In practice
Safe mooring practice is governed by SOLAS II-1 (structural and equipment requirements), classification society rules, and guidance from OCIMF's Mooring Equipment Guidelines, which provides recommendations on line breaking loads, fairlead arrangements, and mooring point spacing for tankers. Port regulations specify minimum line requirements and may mandate the use of quick-release hooks. The chief mate is responsible for planning and supervising mooring operations, while the bosun typically takes charge of the fo'c'sle party. Line handling errors, snap-back zones, and unsafe working loads are primary injury causes, so personnel briefings and the wearing of appropriate PPE are essential before any mooring evolution.
Regulatory detail & full definition
Mooring is the process of securing a vessel to a fixed or floating structure using a combination of lines, ropes, wires, chains, and mechanical fittings to prevent unintended movement in response to wind, current, and tidal forces. A standard mooring arrangement employs headlines and stern lines to limit fore-and-aft movement, breast lines to hold the vessel against the berth, and spring lines to resist surging. The configuration is adapted to the vessel type, berth layout, tidal range, and prevailing weather.
Safe mooring practice is governed by SOLAS II-1 (structural and equipment requirements), classification society rules, and guidance from OCIMF's Mooring Equipment Guidelines, which provides recommendations on line breaking loads, fairlead arrangements, and mooring point spacing for tankers. Port regulations specify minimum line requirements and may mandate the use of quick-release hooks. The chief mate is responsible for planning and supervising mooring operations, while the bosun typically takes charge of the fo'c'sle party. Line handling errors, snap-back zones, and unsafe working loads are primary injury causes, so personnel briefings and the wearing of appropriate PPE are essential before any mooring evolution.