A guide to help fishing vessel owners, operators and crew better understand how vessel stability works, and hazards to look out for.
AMSA 507
Contents
The importance of stability:
- The basics of stability: buoyancy and gravity
- How the forces of buoyancy and weight are simplified
- How the centre of gravity moves How the centre of buoyancy moves
- How stability changes as a vessel rolls over
Stability hazards to look out for:
- Modifying a vessel or installing new fishing gear
- Overloading leading to capsize
- Swamping of the deck and ‘free-surface effects’
- Water ingress and downflooding
- Shifting catch or fishing gear Stabilisers Trawling, dredging and towing
- Fouling or snagging of fishing gear
- Lifting, pulling on board or splitting the catch
- Lifting the catch at the stern with an A-frame
- Lifting or winching at the side Risks from heavy seas, breaking waves and broaching
- Planning your stability for the whole trip
- Inclinometers and how they help
Last updated:
11 February 2026