船橋における見張り作業について

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This paper describes the result of an experimental study with regard to a visual lookout at sea. On the basis of an onboard experiment performed on a training ship, the author obtained the following results. 1) The fact that it is hard to keep a good lookout in the civil twilight, which is well known to marine navigators, was verified in terms of quantity. 2) At night, it is difficult for a person in low visual acuity (0.5 or less) to recognize navigation lights with naked eyes at the minimum ranges required to be visible by the Rule. 3) In the civil twilight, it is also difficult for a person in satisfactory visual acuity to recognize navigation lights at the above-mentioned ranges. 4) On the visibility of deuteranopic observers classified as middle degree; a) In the daytime, they can distinguish fairway buoys (port hand, starboard hand and center line marks) within the range of about three hundred meters. Over that range, they are likely to mistake. b) At night, they can distinguish the colours of "Sidelights" or lights of buoys within the range of about one thousand meters. Beyond that range, they are apt to mistake. c) At night, they are inclined to mistake in the circumstances that many various lights exist in the vicinity of an objective light. d) It is difficult for them to distinguish the coloured flashing of navigation aids. The above results finally conclude; 1) A person in low visual acuity should wear suitable glasses to keep a good lookout during his watch at sea. 2) The further examination and consideration will be necessary to draw better conclusion for the lookout by deuteranopic observers.
社団法人日本航海学会の論文
1987-03-25

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