Chart no 1 nautical chart symbols abbreviations and terms pdf

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chart no 1 nautical chart symbols abbreviations and terms pdf

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U.S. Chart No. 1 (Chart Symbols)

PDF Document Supplementary information may be given in a table, note or graph. Chart datum is the low water plane to which are referenced the depths of water over features permanently covered by the sea and the elevations of those features which are periodically covered and uncovered. Some low waters can be expected to fall below chart datum. This only occurs under certain astronomical conditions, but, where the range of tide is small, meteorological disturbances may cause even average tides to fall below chart datum.

In non-tidal waters, a low water level is adopted as datum. The units used for soundings metres, fathoms or feet are stated in the title of the chart. Depths are expressed in the following ways on Canadian charts:. On certain charts for use by deep-draught vessels and where the depth information is sufficiently precise, soundings between 21 metres 11 fathoms and 31 metres 16 fathoms may be expressed in metres and decimetres fathoms and feet.

The geographical position of a sounding is the centre of the depth figure. Underlined figures on drying areas or in brackets against features are elevations above chart datum. Where the drying elevation figure cannot be placed in its exact position, it is placed close to it and enclosed in brackets.

On charts of tidal waters, elevations of lights, islands, etc. On charts of non-tidal waters, elevations and vertical clearances are normally given above chart datum. The datum for elevations and clearances is always stated in the chart title. When an elevation figure cannot be placed on the feature, it is placed close to it and enclosed in brackets. On metric charts, the vertical clearance is given in metres and decimetres up to On non-metric charts the vertical clearance is given in feet.

The name and date of the horizontal datum used for a chart are shown in the title with a statement, where appropriate, about the corrections to be applied to the geographical positions to convert them to the international reference system of the internationally recognized regional datum.

The natural scale is the ratio between a measurement on the chart and the actual distance on the surface of the earth.

It is expressed with a numerator of 1 e. The international nautical mile is equal to metres A sea mile is the length of one minute of arc, measured along the meridian, in the latitude of the position. The colour presentation and size of symbology on Canadian charts is not always in accord with that shown in this publication. Lettering styles and capitalization vary considerably on charts published by the CHS and may not be exactly as shown in this publication; however, no change in meaning is implied by these differences.

Where the limits or references to larger-scale charts are shown, they should normally be used as they contain further essential navigational information.

The three terms described below are used to indicate the publication status of Canadian charts. The first publication of a Canadian chart that covers an area not previously charted to the scale shown, or that covers an area different from any existing Canadian chart.

A new edition is a new issue of an existing chart that contains amendments essential to navigation in addition to those issued in Notices to Mariners. A new edition renders existing editions obsolete. A reprint is a new print of the current edition of a chart that incorporates no amendments of navigational significance other than those previously promulgated in Notices to Mariners.

It may also contain amendments from other sources provided that they are not essential to navigation. Previous printings of the current edition remain in force. Chart 1 and Updates to Chart 1 are now available online. As well, information concerning Canadian Nautical Charts, Sailing Directions, Tide Tables and other government publications of interest to mariners can be found at www.

Users wishing to receive the weekly updates for their charts can do so by setting up a "User Profile" on the web site. This feature permits users to register the nautical charts they currently have in their possession. Registrants are then automatically notified by e-mail when a Notice to Mariners is published concerning these charts. Depths are expressed in the following ways on Canadian charts: Metres and Decimetres up to 21 metres and in Metres only in depths greater than 21 metres.

Metres and Decimetres up to 30 metres and in Metres only in depths greater than 30 metres. Fathoms and Feet up to 11 fathoms and in Fathoms only in depths greater than 11 fathoms. Fathoms and fraction of fathoms on a few older charts. Document Navigation Previous Complete Text

Symbols and Abbreviations on Maritime Charts

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U.S. Chart No. 1. Symbols, Abbreviations and Terms used on Paper and Electronic Navigational Charts. 13th Edition. April 15, Prepared Jointly by.


U.S. Chart No. 1 (Chart Symbols)

An increasing number of ports are introducing specific quarantine reporting requirements with regards to this virus. Its continued spread is also impacting a number of other services. Due to the ongoing and dynamic nature of the situation, mariners should contact the appropriate Port Authority, VTS, Pilot, coastguard, radio station or other designated body covering their planned route and destination, for the latest advice and procedures.

New Edition of U.S. Chart No. 1 Available

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