What are ‘Stabilisers’ used for on ships??

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This video uses pictures to explain what are stabilisers and their role on passenger and cargo ships. Contents of this video will benefit mariners preparing for exams (written and oral examinations).
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[@piyushdev19]

Why stabilizers are not installed on cargo vessels. Are there any challenges to do so?

[@GeorgeWallace-l1s]

Denny Brown were the best