You are on the bridge of a 2,400 GT motor yacht, inbound to a Mediterranean port at 0630. The berth is a starboard-side-to, port-side wall on your starboard bow. Wind is 15 knots off the quay; there is a 0.8-knot cross-tide setting you onto the wall. The pilot has just left. Your single fixed-pitch propeller has a right-handed screw. The port agent radios: the tug you requested is unavailable. You have a bow thruster, no stern thruster. The decision — whether to attempt the berth, wait, or request alternative arrangements — is yours alone.
This vignette frames everything below.
The master's pre-berth assessment
Before you commit, you are weighing five factors simultaneously:
- Wind effect: varies with freeboard and superstructure; high-windage yachts respond quickly when slow. Wind off the quay here is, in principle, helpful — it will assist separation on departure and resist set-on arrival — but at 15 knots against the tide vector, the net drift must be calculated, not assumed.
- Tidal stream: 0.8 knots setting onto the wall is significant at slow approach speed. Stemming the tide gives you steerage; going with it loses it. In this case the tide is adverse; you need more water speed than ground speed to maintain control.
- Propeller effect: a right-handed propeller in astern kicks the stern to port (transverse thrust). Starboard-side-to, using astern to check way, will pull the stern away from the berth — useful here. Had it been port-side-to, that same kick works against you.
- Bow thruster authority: effective only at very slow speed (typically below 2–3 knots, vessel-dependent). Do not rely on it to correct an approach that has gone wrong at speed.
- Tug dependency: if the safe execution of the manoeuvre genuinely requires tug assistance, and the tug is unavailable, the correct command decision is to wait or seek a different berth. Proceeding without adequate means is the master's liability, not the port's.
Approach geometry
For a starboard-side-to berth with wind off the quay and tide onto it:
- Come in at a steeper angle (30–40°) than you would in calm conditions; the tide will flatten the approach naturally.
- Maintain enough water speed for steerage — do not let the tide stop you.
- Lead with the bow; get a headline and spring ashore before the stern swings in.
- Use short burst of astern to check way; right-handed screw kicks stern to port (away from berth) — acceptable here, forward spring from midships can counter this.
Buoy mooring
Approach from downwind and up-tide (whichever is stronger). Stop the vessel over the buoy with bow slightly upwind of it. Assign a dedicated lookout to the bow to direct the conn. Secure the bridle or pennant before the vessel is committed to a position she cannot hold with engines.
Unberthing considerations
With wind on the berth, springs are your primary tool. Heave on the stern spring; let the bow blow off; leave the stern spring until last. A tug is far more valuable for unberthing against wind than for berthing, because you have time and control when berthing but almost none once the bow is pinned on departure.
Command principle
You own every decision. Pilotage advice, tug availability, and port instructions inform you — none of them transfer responsibility. If conditions exceed the vessel's safe manoeuvring envelope, you stop, anchor, or request delay. That decision must be recorded in the log with your reasoning.