NAUTICAL CHART 



SYMBOLS AND ABBREVIATIONS 



USED BY THE 



COAST AND GEODETIC SURVEY 



General Remarks 



(J) Soundings are expressed in feet or fathoms as stated in the title of the chart. 



(2) The visibility of lights is in nautical miles for an observer's eye 15 feet above water level. 



(3) N A 1927 at the upper right-hand corner of the chart is an abbreviation for "North American 

 datum of 1927". 



(4) Longitudes are referred to the Meridian of Greenwich. 



(5) The coastline is the line of mean high water, except along mangrove and marsh. 



(6) Nautical charts, unless otherwise noted in the title, are constructed on the Mercator projection, and 

 are computed for the middle latitude of the chart or the middle latitude of a series of charts. 



(/') Heights of land and conspicuous objects are given in feet above mean high water, unless otherwise 



stated in the title of the chart. Elevations of rocks, lighthouses, contours, and hills, are in feet above 

 mean high water. Underlined elevations of mountain peaks are In feet above mean sea level. 



(8) Dredged channels are shown by limiting dash lines with the depth, month, and year of 

 latest examination. 



(9) Explanation of marginal notes may be found in the Coast Pilot, and in the Chart Catalog. 



(10) The use of capitals and the style of lettering given on this sheet is not always rigidly adhered to on 



the charts. 



(21) Caution note: CAUTION 



Temporary changes affecting 



Lights, Buoys and Day Beacons 



Aids which have been destroyed or removed, but which 



will be reestablished and are temporarily replaced by aids 



of different characteristics, are indicated in color by the 



following abbreviations. 



D Destroyed, to be reestablished. 



T R B Temporarily replaced by a red buoy. 



T B B Temporarily replaced by a black buoy. 



T F B Temporarily replaced by a fixed white lighted buoy. 



T F R B ■ Temporarily replaced by a fixed red lighted buoy. 



T FL B Temporarily replaced by a flashing white lighted buoy. 



T FL R B Temporarily replaced by a flashing red lighted buoy. 



T FL G B Temporarily replaced by a flashing green lighted, buoy. 



(12) The use of colors is optional and some of them may be changed for special reasons. 



Symbols and abbreviations are numbered in accordance with a standard form proposed by the International 

 Hydrographic Bureau. 



Vertical figures indicate that the symbol or abbreviation is in accordance with the I. H. B. standard. 



Symbols or abbreviations which differ from those of the I. H. B., or which do not appear on the standard 

 are indicated by slant figures. 



Figures in parentheses indicate that the symbol or abbreviation is in addition to those shown on the standard. 



No periods are used after abbreviations placed in water areas. 



Figure 189. — Symbols and abbreviations for nautical charts (part I). 



