Question 1

Your vessel is coming alongside port-side to at a tidal berth. As OOW aft, what mooring lines do you use, in what order do you secure them, and what hazards do you watch for?

Accepted Answer

MOORING alongside port-side: Line types and positions: (1) HEAD LINE (forward, leading ahead from the bow); (2) FORWARD BREAST (bow to quay at right angles); (3) FORWARD SPRING (from bow leading aft along the quay); (4) AFT SPRING (from stern leading forward along the quay); (5) AFT BREAST (stern to quay at right angles); (6) STERN LINE (from stern leading aft). ORDER of securing: the first line ashore is typically the FORWARD SPRING — this stops the vessel moving ahead and holds the bow to the quay; then HEAD LINE and STERN LINE to prevent the vessel surging away; then SPRINGS and BREASTS. As OOW AFT: control the aft lines, communicate with the bridge on VHF regarding stern position, watch for: (a) ropes under tension falling slack suddenly (snap-back zone — anyone within 1 rope-length of the line could be killed by snap-back); (b) bights of rope in the water around the propeller; (c) crew working in the snap-back zone — ensure no one stands directly behind a taut line or in the bight; (d) dockside hazards — bollards, dock edge, other vessels; (e) tidal rise/fall: adjust mooring lines as the tide changes. Mooring operations are a consistent OOW exam topic combining practical seamanship with safety management. Spring lines: the springs are the most important functional lines in a mooring — they prevent surge (fore/aft movement). A forward spring (from bow, leading aft to quay) prevents the vessel surging forward; an aft spring (from stern, leading forward to quay) prevents the vessel surging astern. Without springs, breast lines alone cannot prevent fore-aft movement in tidal and swell conditions. Snap-back risk: when a synthetic or wire mooring line under high tension parts, it recoils with enormous energy — potentially fatal to anyone in the line of recoil. The snap-back zone is approximately a cone of one rope-length around the point of failure. COSWP Chapter 24 covers mooring operations safety. Tidal considerations: at a tidal berth the mooring lines must be adjusted as the tide rises and falls — slack lines can fall in the water (propeller risk), tight lines prevent vertical movement (overstressed lines risk). The OOW must brief the berthing watch to monitor lines throughout tidal changes.

Question 2

Your vessel is approaching a UK port at night. The pilot has been ordered for 0200. As OOW, what are your preparations and responsibilities when the pilot boards?

Accepted Answer

OOW pilot boarding responsibilities: (1) PREPARE: ensure pilot boarding station is rigged correctly — pilot ladder complies with SOLAS V/23: secured to strong points, spreaders fitted if freeboard exceeds 9m, man-ropes rigged, deck lighting on, lifebuoy with light and line ready at the boarding position, officer present at the ladder foot; (2) COMMUNICATE: confirm ETA and pilot boarding position with the pilot station via VHF; confirm pilot ladder or combination ladder (helicopter?); (3) NIGHT PREPARATIONS: illuminate the ship's side at the pilot ladder; ensure the bridge has the pilot card prepared (vessel particulars, draught, GM, LOA, beam, manoeuvring data); (4) WHEN PILOT BOARDS: inform master immediately; note time of boarding in the deck log; pilot takes the conn — master retains command; OOW assists with communications (VHF Ch 12/16, calling tugs, relaying helm/engine orders), maintaining deck log, monitoring position on ECDIS/radar; (5) MASTER'S AUTHORITY: SOLAS V/34 — the pilot's presence does not relieve the master of responsibility for the safety of the vessel. If the pilot gives an order the OOW or master believes is unsafe, it must be challenged immediately. SOLAS V/23 specifies pilot transfer arrangements in detail. The pilot ladder must: be secured to strong points on the ship's structure; extend to a position as near as practicable to the waterline; have wooden spreaders; have man-ropes or hand-hold ropes. SOLAS V/34 explicitly states that compliance with pilot requirements does not relieve the master and officers of the duty to carry out obligations for safe navigation. The pilot is a compulsory servant in most UK ports — the shipowner is NOT vicariously liable for the pilot's negligence when the pilot is compulsory (Pilotage Act 1987 s.16). However, this does not remove the master's overriding authority. The bridge team must remain fully active throughout the pilotage — monitoring position, depth under keel, tugs, VHF, and verifying the pilot's actions.

Question 3

Your vessel is ordered to anchor off a busy UK port to await a berth. As OOW, how do you select an anchorage position and execute the anchoring?

Accepted Answer

ANCHORING procedure: (1) ANCHORAGE SELECTION: consult the chart, pilot book, and port authority instructions — identify designated anchorage areas; check charted depth (aim for 15-30m in most commercial anchoring); check seabed type (mud or sand preferred — better holding than rock); calculate swinging room (vessel length + scope × depth = minimum clear radius); check for nearby obstructions, pipelines, cables; confirm wind and tidal stream direction for the approach; (2) APPROACH: approach slowly, heading into the tidal stream (or wind if stream is negligible) to maintain steerage with minimum speed; stop the vessel when the bow anchor is over the intended dropping position; (3) LET GO: master's order — walk back the anchor to the surface, then let go; allow the vessel to drift/move astern slowly; pay out scope as the vessel moves back — ideally 5-7 × depth (or as instructed); (4) BEARING CROSS: take two or three compass bearings on fixed charted objects as the anchor runs out; this is the anchor bearing — the vessel's position when the anchor was dropped; monitor for dragging by comparing cross bearings or ECDIS position; (5) LOG: record time, position, depth, scope of cable, holding ground, and weather in the deck log. Anchoring is a fundamental seamanship skill. The approach into the tidal stream: with the vessel moving slowly head-to-tide, the anchor is dropped ahead of the intended position and the vessel falls back as chain is paid out, laying the chain along the seabed (rather than piling it on top of the anchor). The scope (cable paid out / depth): 5-7× depth is a rule of thumb for reasonable holding. More scope = more holding power and more swinging room needed. Less scope = risk of dragging. Bearing cross: fixed bearings are the classic method for confirming the anchor is holding. If both bearings remain constant, the anchor is holding. If bearings open or close, the vessel is swinging (acceptable in a tidal change) or dragging (investigate and be ready to manoeuvre). ECDIS anchor watch: most modern ECDIS systems have an anchor watch function that triggers an alarm if the vessel moves outside a set radius — use this as a supplement but not a replacement for bearing monitoring.