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The World Port Index (PUB 150) contains a tabular listing of thousands of ports throughout the world, describing their location, characteristics, known facilities, and available services. Of particular interest are the applicable volume of Sailing Directions and the number of the harbor chart. The table is arranged geographically, with an alphabetical index. The selection of these places is based on criteria established by the National Geospatial-Intelligence Agency. They are not random choices. The applicable chart and Sailing Directions is given for each place listed. In order to present such a large amount of diversified data in a single volume of convenient size, a simple code is used to indicate certain types of information. The code symbols are explained at the top of each page of text. This book is corrected by the National Geospatial-Intelligence Agency. ==Source== The text of this article originated from the preface of the ''World Port Index'' and section 413 of The American Practical Navigator. These documents are produced by the government of the United States of America and in the public domain. 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「World Port Index」の詳細全文を読む スポンサード リンク
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