All Dealers are now required to sell only copies of the U.S. Chart No. 1 edition 12, in order to insure that mariners have the most up-to-date information.New in Edition 12: ECDIS Symbols and Other ECDIS InformationSymbology for displaying Electronic Navigational Charts (ENC's) on an Electronic Chart Display and Information System (ECDIS) has been added to U.S. Chart No. 1. 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 below. The ECDIS pages are also listed in the table of contents in italic type.