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Anti-collision Manœuvres when using Radar

Published online by Cambridge University Press:  18 January 2010

Hugh Topley
Affiliation:
(Ministry of Transport and Civil Aviation)

Extract

When using radar in thick weather as an anti-collision warning device it is necessary, when planning any manœuvre, to consider the effect of the proposed alteration of own vessel's course and/or speed on the PPI presentation of the target vessel's radar, should she be using it. An alteration of course or speed of own vessel will alter the direction or speed of the apparent motion of the spot on the target vessel's PPI. As the apparent motion on relative plots kept by the two vessels are reciprocal images of each other it is a simple matter to determine, in any particular case, the effect on the target's plot of own vessel's manœuvre by considering the effect on the apparent motion on own vessel's plot.

Type
Research Article
Copyright
Copyright © The Royal Institute of Navigation 1954

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References

REFERENCE

1Plotting as an aid to the avoidance of collision at sea: an Institute working party report (1954). This Journal, 7, 219.Google Scholar