The objective of this booklet is to provide guidance on the safe use of electronic navigation and associated systems on leisure vessels. Navigating a leisure vessel has always required the skipper/navigator to use all available information and that has never been more important than now, with the availability of ever increasing sources of information. Good navigational safety is still dependent on the continuous assessment by the skipper/navigator of all the navigation-related information available on the vessel – and not just over-concentrating on some, however beguiling they may be.