Some Sea Traffic Records between Tokyo and Singapore

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  • 東京・シンガポール間における遭遇船の実態
  • トウキョウ シンガポールカン ニ オケル ソウグウセン ノ ジッタイ

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A series of observations with a radar on the bearings and distances of ships encountered was made on board a refrigerator boat, 413G/T, cruising at 10.6 knots, throughout a round trip of 3, 300n. miles between Tokyo and Singapore, from 4th August to 9th September, 1977. The speed and course of any ship appeared within a 15n. mile range on the radar screen, were determined, and distances between any two ships and distances between them at the nearest point were estimated. The whole observed area was devided into five waters. The mean values of speeds, densities, et al. of ships encountered were calculated by waters. The mean value of every item was the highest in the South China Sea ; e.g. the mean density was 0.005 ships/sq.n. miles in this waters as compared to 0.002 of grand mean.

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