A vessel is moored alongside a berth when another vessel passes close by at speed. What effect can this have on the moored vessel, and what guidance addresses this (e.g. MGN 199)?

A. The passing vessel's hydrodynamic pressure wave and suction (interaction) can cause the moored vessel to surge, sway, or range against the berth, placing sudden excessive loads on mooring lines (risking parting) and potentially causing the vessel to contact the berth or fenders — guidance highlights managing passing vessel speeds in confined waterways and ensuring moorings are tended/monitored

B. There is no effect on a securely moored vessel regardless of the passing vessel's speed

C. The effect is limited to changing the moored vessel's compass heading permanently

D. The only effect is a temporary loss of shore power connection

A. The tidal height at the time of transit to confirm sufficient under-keel clearance

B. The yacht's fuel consumption for that leg

C. The colour of the seabed shown on the chart

D. Only the distance to the next waypoint

A. Switch the ECDIS to standby mode and navigate by GPS position alone

B. Ignore it — ECDIS alarms are frequently false and can be left running

C. Assess the situation against the planned route and charted depths, take action to maintain safe water, and inform the Master if there is any doubt

D. Acknowledge and silence the alarm immediately so it does not distract the helmsman