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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Digital obstacle file ： ウィキペディア英語版 Digital obstacle file The Digital Obstacle File (DOF) describes all known obstacles of interest to aviation users in the United States, with limited coverage of the Pacific Ocean, the Caribbean, Canada and Mexico. The obstacles are assigned unique numerical identifiers and accuracy codes.〔 (【引用サイトリンク】 Digital Obstacle File ) 〕 These downloadable products are available at least 21 days prior to their effective date. Data updates (also known as "chart updates") are coordinated over 56-day cycles.〔(【引用サイトリンク】title=Standing Orders for 56-Day Cycle Aeronautical Publications and Charts )〕 There are six to seven of these updates per year. Editions will be listed by year and 56-day cycle number; for example, Edition 200801 was the first 56-day cycle of 2008 (i.e. February 14, 2008). ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Digital obstacle file」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.