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CASE 9<br />
The Lessons<br />
1. Hydrodynamic interaction is a<br />
phenomenon routinely encountered by<br />
many vessels in different ways such as<br />
‘squat’ and ‘bank effect’. These effects can<br />
be allowed for during passage planning but<br />
the effects of interaction resulting from a<br />
vessel passing other vessels and objects at<br />
close range are more difficult to anticipate.<br />
Therefore, when operating in confined<br />
water in close proximity to other vessels,<br />
the possibility of a sheer should always be<br />
borne in mind. Guidance on the dangers<br />
of interaction is provided by the MCA in<br />
MGN 199(M+F).<br />
2. Effective steering is critical to vessel safety.<br />
If a steering system is difficult to use and<br />
the helmsman has no indication of the<br />
rudder angle and no visual references to<br />
gauge a vessel’s rate of turn, difficulties<br />
are bound to arise. Equipment fit is not<br />
just about complying with regulations,<br />
fitness for purpose is just as, if not more,<br />
important.<br />
20<br />
MAIB Safety Digest 1/2017
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