Original scientific paper
METHODS OF CALCULATING THE SHIP'S SQUAT AND ITS PREDICTION USING AIS IN VTS
Robert Mohović
Lovro Maglić
Abstract
This paper aims at presenting and comparing the methods of calculating ship’s squat, and their possible application in VTS services for predicting the danger of grounding. Analyzing and comparing the existing empirical formulas, various methods and their suitability for different types of ships and waterways are discussed. VTS services have detailed information regarding the waterways within the area of jurisdiction, and all static and dynamic ship data are available using the AIS system. Based on the above mentioned, the paper presents the possibility of integrating squat empirical formulas, the necessary ship's data retrieved from AIS system, and vector electronic charts. The Main goal is to point out that VTS services can approximately determine the squat of the ship underway, and predict imminent danger of grounding due to reducing under keel clearance below the critical value. Calculations and conditions are proposed for predicting and alarming the critical under keel clearance in real time.
Keywords
Squat; under keel clearance; VTS; AIS
Hrčak ID:
62892
URI
Publication date:
30.12.2010.
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