Abstract
The purpose and scope of this article is to present the best marine practices and author's own researches used to determine the ship's domain height understood here as a ship's air draft increased by required overhead clearance (OHC) and analysis the safest and best possible speed of the ship when passing under bridges or other suspended water obstacles (power cables, rope-ways, pipes, natural rock vaults etc.). The author also presents a method that can be used to estimate the so-called navigational risk factor RNH (specified in the range from 0 to 1) developed in relation to obstacles suspended above water surface on the ship's crossing route based on the analysis of a three-dimensional model of the ship's domain. The essence of the method proposed in this paper is a systematic approach to the operation of a seagoing ship in the aspect of assessing its navigation safety (navigational risk factor) when manoeuvring in restricted sea areas, in particular when passing under bridges or other suspended obstacles.
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