Logbook - Koukainisshi

Among the various types of logbooks kept on board, the ship's logbook is specifically called a log book. All important matters concerning the ship's operation are recorded, whether at sea or anchored, but the word originates from the fact that in the past, particular importance was placed on recording the log readings during the voyage. The main ship's logs are the deck logbook, the engine logbook, and the radio logbook, and the deck logbook includes the deck watch logbook, the ship's logbook, the main logbook, and the official logbook. The deck watch logbook is always kept in the bridge chart room, and the officer on duty records the ship's arrival and departure in port, course, itinerary, course changes, time of passage at key points, engine RPM, weather, wind direction, wind force, cargo handling conditions while anchored, onboard operations, accidents, etc. according to a set format. The ship's logbook is a clean copy of the deck watch logbook, which is checked and signed by the captain every day and serves as an important official record of the ship's voyage. The essential logbook is a simplified summary of the main points of the ship's logbook for each voyage, and is used as a business document. The official logbook is required to be kept by the Seamen's Act, and the items to be recorded and the period for which it must be kept on board are specified.

[Fumihiko Kawamoto]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

船内で記録される各種の日誌のうち、船用航海日誌をとくに航海日誌（ログ・ブックlog book）という。航海中、停泊中を問わず、船の運航に関する重要事項はすべて記録されるが、昔は航海中の測程儀（ログ）示度をとくに重視して記録したことに語源がある。おもな船内日誌には甲板(こうはん)部日誌、機関部日誌、無線部日誌があり、甲板部日誌には甲板部当直日誌、船用航海日誌、撮要航海日誌、官用航海日誌がある。甲板部当直日誌は、常時船橋海図室に備え、当直航海士が一定の書式に従って船の出入港、針路、航程、針路の変更、主要地点の通過時刻、機関回転数、天候、風向、風力、停泊中の荷役状況、船内作業、事故などを記載する。船用航海日誌は、甲板部当直日誌を清書し、毎日船長が点検、署名して、船の重要な航海公式記録となるものである。撮要航海日誌は、船用航海日誌の要点を抜粋して一航海ごとに簡略にまとめ、営業上の資料とするものであり、官用航海日誌は、船員法によって備え付けを命ぜられ、記載事項や船内保存期間の定められたものである。

［川本文彦］

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