Squat is a form of interaction which occurs between the underside of the vessel and the closeness of the sea bottom to the keel. It is a shallow water effect on the ship’s hull which could influence the steering of the vessel and the overall control of the vessel. The effect is generally amplified by the speed of the ship over the ground, combined with underkeel clearance and blockage factor in canals/rivers, etc. Squat effect has been directly linked to speed2 and to this end a positive and immediate reduction in speed will reduce or even eliminate detrimental effects of squat in shallow waters. Alternatively the vessel should seek deeper waters where the interactive effects of the sea bottom make squat effect, insignificant.
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