Transactions of Navigation
Online ISSN : 2189-5511
ISSN-L : 2189-5511
Original
Proposal of Auxiliary Stern Light and The Effect of the Auxiliary Stern Light for Estimating the Course of Another Vessel in an Overtaking Situation
Shoji FUJIMOTOShun SAKUMAKohei HIRONOTomohisa NISHIMURAMatthew ROOKSHiroshi SEKINE
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JOURNALS FREE ACCESS

2019 Volume 4 Issue 1 Pages 1-9

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Abstract

When the Officers on the Watch (OOW) will decide on overtaking another vessel at night time, the OOW relies solely on visual information from “a white light (stern light).” Therefore, the “stern light” is a very important factor in overtaking situations. The OOW can recognize another vessel in front of their own vessel by identifying the “stern light.” The stern light’s arc on the horizon is 135 degrees, and fixed so as to show the light 67.5 degrees from right aft on each side of the vessel, which can make it difficult for the OOW to estimate the proceeding direction of another vessel. Previous research pointed out that “poor surveillance of another vessel” was the most common cause in collision cases related to stern light visual confirmation. Therefore, it is most important that the OOW will be estimate the proceeding direction of other vessel to be overtaken.

This paper focuses on an analysis of a questionnaire survey for pilots and coast guard officers. The contents of the questionnaire survey investigate ① “When you look the another vessel’s stern light by naked eyes in overtaking situation at the night time, how do you think about the proceeding direction of the another vessel?” ② “When you look another vessel’s proposal new auxiliary stern light by naked eyes in overtaking situation at the night time, how do you think about the proceeding direction of the another vessel?” ③ considered the effect and the issue of proposal new auxiliary stern light.

The results suggest that ①Responders had not been able to estimate the proceeding direction of the another vessel. Furthermore, the estimated proceeding direction of the another vessel were various and big difference. ②In the proposal new auxiliary stern light case, responders had been able to estimate the proceeding direction of the another vessel. In addition, the proposal new auxiliary stern light was possible to reduce the width of the estimated proceeding direction of the another vessel. ③The proposal new auxiliary stern light was effective for estimating the proceeding direction of the another vessel, however, it had a possibility of making a misunderstanding another navigational light (ex. Small boat).

After a background review of this issue, this paper will analyze the data from the questionnaire results, and finally discuss conclusions and offer some suggestions for measures to correct any problems, as well as directions for future research.

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この記事はクリエイティブ・コモンズ [表示 - 非営利 - 改変禁止 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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