Method for vessel grounding alert based on fuzzy theory

A method for vessel grounding alert based on fuzzy theory was proposed.The geographic vector data of the hazardous zones were extracted from electronic navigational charts(ENC) database,and the geometry model for the vessel and hazardous area was established,and the grounding risk index(GRI) based on fuzzy theory was calculated.Experimental results demonstrate that GRI can accurately reflect the grounding danger along one ship's instantaneous track,which can be a important reference for VTS manager in judging whether the vessel facing grounding.