Question 1

Why is downflooding through an open or poorly secured door, hatch, or freeing port considered such a critical hazard specifically on small fishing vessels?

Accepted Answer

Small fishing vessels typically have low freeboard and limited reserve buoyancy, so even a modest amount of water entering through an open opening can rapidly worsen a heel and progress to capsize, especially in combination with a gear-related stability event Low freeboard means there is little margin before deck-level openings are at or below the waterline once the vessel heels, even slightly. Combined with limited reserve buoyancy, water ingress through an open door or hatch can turn a recoverable heel (e.g. from a snagged trawl) into a fatal capsize within seconds — this is the classic combination behind many fishing vessel losses.

Question 2

What is the principal cause of fatal accidents on UK fishing vessels, according to the long-running pattern identified by MAIB investigations?

Accepted Answer

Capsize or foundering, very often linked to loss of stability while hauling or shooting gear, downflooding through open or unsecured openings, or overloading Capsize/foundering, frequently triggered by a stability event during gear hauling/shooting (e.g. a snagged trawl pulling the vessel over) combined with downflooding through an open door, hatch, or freeing port, is the single most consistent cause of fishing vessel loss of life in UK waters — which is why the Small Fishing Vessel Code places such heavy emphasis on stability and watertight integrity.

Question 3

What is the "Wolfson Method" used for under the Code of Practice for the Safety of Fishing Vessels less than 15m LOA?

Accepted Answer

A simplified stability assessment method, developed for small fishing vessels, used to generate practical stability guidance (the Wolfson Stability Notice) without requiring a full naval-architect inclining experiment The Wolfson Method was developed (by the Wolfson Unit) specifically to give owners of small fishing vessels — who may not have access to full naval architecture support — a practical, affordable way to assess and demonstrate their vessel's stability, with the output displayed aboard as the Wolfson Stability Notice.