Today's mariner is looking for something with the same standards of quality as the traditional standard paper chart, but which fits the demands of a new navigational era. Electronic navigation, although still relatively new and unfamiliar, is becoming increasingly more common, particularly on board commercial vessels. This guide aims to provide answers to some of the most commonly asked questions regarding electronic charts (ENC, RNC, DNC) and electronic chart systems (ECDIS, RCDS, ECS). The book will be of specific interest to those who need to know about selection, implementation, operational use, benefits, and management of ECDIS and ECS systems, but do not need to know all the technical details of how a ECDIS/GIS actually 'works', technically. The IAMU model course on training in the operational use of ECDIS presented in this book may be used by staff and students of any maritime university, navigational faculty and training institution as alternative or supplement to IMO Model Course 1.27.