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Göteborg: 8 August 2022

Container Vessel Operators - Beware of parametric rolling in following seas

The International Group is a member of the Maritime Research Institute of the Netherlands (MARIN) Top Tier project. The project has been established to examine and assess the causes of container losses arising from at-sea incidents onboard various sizes of container ships, with a particular focus on ultra-large ships.

The project has been approved by a cross-section of industry, academic and government interests, and MARIN will produce a report of its findings, including recommendations, in due course. It is envisaged that the recommendations will eventually lead to operational and technical improvements that should mitigate the risk and underlying causes of container losses at sea.

The International Group has received the Roll Risk Estimator tool. Check here to download. It indicates combinations of speed, heading and wave period that result in the unfavourable tuning of roll motions that should be avoided. It does not give indication of the maximum roll motion, and at which wave height the vessel is vulnerable to adverse rolling must be judged by the master's experience. In addition, it does not address other dangerous ship behaviour like, e.g. large vertical accelerations, shipping green water and slamming.

For further details about the Roll Risk Estimator and the Top Tier project, please visit MARIN's homepage at:

All Clubs have issued a similar alert.


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