Admiralty Guide to ENC Symbols used in ECDIS
"A companion to NP5011, intended to be used both as a training aid and as a reference during passage planning and navigation, this guide contains comprehensive information relating to ENC symbols.
The publication provides graphics showing both the traditional and the simplified forms of symbols, as well as descriptions of the use of the symbol that can be understood by the intended users (international seafarers) with reference to the chart 5011 / INT1 equivalent symbol where applicable."