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2 TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2 2009

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The Display Mode for Choosing the Manoeuvre for Collision Avoidance

Vagushchenko L., Vagushchenko A.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2009

Vol. 3, no. 3

327--329

The display mode is intended for facilitation of building strategies for collision avoidance by so-called B-manoeuvres. It can be used in ECDIS, ARPA and the simulator systems. B-manoeuvre includes the segment of deviation at a certain angle from the initial course and at the end of it the segment parallel to the initial way’s line (planned route). The offered mode is based on the use of forbidden domains for B-manoeuvres. These domains allow choosing parameters and beginning moment of B-manoeuvre for collision avoidance with one or a few vessels. The account of presence of navigation hazards at the choice of B-manoeuvre is produced by setting the borders of maximum lateral shifting from planned route. The offered mode enables visual drafting of strategies for collision avoidance with vessels by successive B-manoeuvres. It is possible to use this mode as basis of computer search of strategies for collisions avoidance with a few targets.

Method of Safe Returning of the Vessel to Planned Route After Deviation from Collision

Tsymbal M., Urbansky I.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2009

Vol. 3, no. 1

81--84

Flexible strategies for collision avoidance, presented at TransNav 2007, were examined using computer program for its correctness in different situations of ships interaction. It was determined, that on short distance the risk of collision can arise again when the vessel returning to the planned route after deviation from collision. For controlling ship’s safe returning, the mathematical model was developed. This model describes the analytical dependence of the rate of changing relative course with respect to rates of turning of the vessels and its initial relative position. This method can be used in automatic systems for controlling the safe returning of the vessel to the planned route.