Passing distance

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As a point of approach , colloquially smallest distance (Closest Approach, Abbreviation: CA), is in the navigation referred to seafaring the distance, with the two ships are expected to meet or actually encounter. The pre-calculation can be carried out using radar plotting or RADAR with an ARPA system or based on the analysis of AIS data. Determining the passage distance is important in order to be able to estimate whether there is a risk of a close-range situation or the possibility of a collision between two ships.

In connection with the passage distance, there are other standard sizes:

  • The closest point of approach (Closest Point of Approach: CPA) is in accordance with DIN 13312, the location of the opponent's closest approach at the time. It is defined by the passing distance and the associated bearing.
  • The abbreviation TCA (Time of Closest Approach) is used for the time of closest approach .
  • The abbreviation TCPA (Time to Closest Point of Approach) is used for the time until the closest approximation .

literature

  • Terheyden, Karl (ed.): Müller-Krauss, manual for ship management . Volume 1, Navigation, Part C. Springer Verlag, Berlin 1986, ISBN 3-540-13484-0 .
  • Standard DIN 13312 "Navigation - terms, abbreviations, symbols, graphic symbols", edition February 2005