noaa chart symbols

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The Chart Users' Guide is updated as necessary when there is new chart symbology or changes in the depiction of information and/or symbols on the charts. Commercial and recreational boaters alike know that nothing replaces the peace of mind that comes from having a reliable paper chart onboard. Storms and other types of weather can have serious effects on waterways, including changes to the water depth you see listed on a chart.Waterways change over time, so don’t rely on old charts. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. The amount of precipitation during the past 6-hours in millimeters. Each type are plotted with a symbol found in the following table. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Plotted to the nearest tenth of a millibar. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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