船舶定位与导航海图的标题栏和图廓注记美国国家海洋及空间局的海图图式（2013版）.pdf

U.S. Chart No. 1 Symbols, Abbreviations and Terms used on Paper and Electronic Navigational Charts 12th Edition April 15, 2013 Prepared Jointly by Department of Commerce National Oceanic and Atmospheric Administration Department of Defense National Geospatial-Intelligence Agency 1 New in Edition 12: ECDIS Symbols and Other ECDIS Information ECDIS Symbology for displaying Electronic Navigational Charts (ENCs) on an Electronic Chart Display and Information System (ECDIS) has been added to U.S. Chart No. 1. See the Preface and Introduction sections for more details. In addition to the ECDIS symbols shown in the traditional lettered sections of U.S. Chart No. 1, there are now several special pages devoted exclusively to providing important details about ECDIS. These pages are distinguished by the ECDIS icon, as shown in the top left corner of this page. The ECDIS pages are also listed in the table of contents in italic type. One major difference in the use of paper charts and ENCs is the ability of ECDIS to display the same feature differently depending on user settings and other conditions, such as a ship’s draft. An important example is that ECDIS displays wrecks, rocks and other obstructions with their traditional “paper-chart” symbols if they are at or deeper than the depth of the safety contour set for the ship. Dangers that are shoaler are portrayed with the unique ECDIS “isolated danger” symbol shown at left. (See the ECDIS Portrayal of Depths page for more information about the ECDIS safety contour.) Another advantage that ECDIS provides over paper charts is enabling users to obtain more information about a feature through a