NP 5011: A Guide to Symbols and Abbreviations Used on Admiralty Charts
NP 5011 is a publication that provides a key to the symbols and abbreviations used on Admiralty and International paper charts compiled by the United Kingdom Hydrographic Office (UKHO). It is based on the Chart Specifications of the International Hydrographic Organization (IHO) adopted in 1982, with later adaptations and corrections. It also includes some supplementary national symbols that have no international equivalent.
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NP 5011 is divided into sections according to the type of information shown on charts, such as topography, hydrography, navigation aids and services, etc. Each section has a letter designation and a number range for the symbols and abbreviations. For example, section P covers lights and has symbols and abbreviations numbered from P1 to P69. Each symbol or abbreviation is accompanied by an explanation and an example of its use on a chart. Some symbols and abbreviations also have cross-references to other sections where relevant.
NP 5011 is an essential reference for anyone who uses Admiralty charts or needs to understand the information they contain. It can help users to interpret the features and hazards shown on charts, as well as to plan safe and efficient navigation. NP 5011 is available in both print and digital formats from UKHO or its authorized distributors.Some of the symbols and abbreviations used on charts are common to all countries, while others may vary depending on the national or regional practices of the chart producer. NP 5011 includes both international (INT) and national symbols and abbreviations used on Admiralty charts. Where both are shown, the international symbols are to the left of the national ones. For example, P4 shows the international symbol for a lighted buoy and the national symbol for a lighted buoy in UK waters.
Some of the symbols and abbreviations used on charts are also influenced by the scale and purpose of the chart. For example, section D covers cultural features such as buildings, roads, railways, etc. The level of detail shown on a chart depends on the scale and whether it is a general, coastal, approach or harbour chart. NP 5011 indicates the scale range for each symbol or abbreviation in this section. For example, D10 shows the symbol for a town or city, which is only used on charts of scale 1:600 000 or smaller.
NP 5011 also provides some guidance on how to use charts effectively and safely. It explains some of the conventions and limitations of chart representation, such as the use of colours, symbols, abbreviations, projections, datums, etc. It also advises users to keep their charts up to date by applying the latest corrections from Notices to Mariners (NMs) or other sources. NP 5011 also refers users to other publications that can supplement their chart knowledge, such as Admiralty Sailing Directions (Pilots), Admiralty List of Lights and Fog Signals, Admiralty List of Radio Signals, etc. 29c81ba772
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