We all rely on charts to navigate at sea – but are we missing essential information? A mass of data is included on each chart and deciphering the many symbols

Chart Number One is essential to correct and accurate use of nautical charts. More than a chart, it is a book that defines the symbols, abbreviations and terms

The essential reference tool for reading maps, published by the Coast Guard, is now available to boaters in an attractive, colorful edition that includes import

As in previous editions, the symbols used on paper nautical charts produced by NOAA and the NGA and digital raster representations of those charts, such as NOAA