44 



NAUTICAL CHART MANUAL 



BLUFFS AND CLIFFS (A-2, -3) 



The terms "bluff" and "cliff" are variously defined. On nautical charts, bluffs are usually 

 considered to be not rocky and cliffs are considered to be rocky. As bluffs and cliffs are of 

 particular value for radar navigation, it is desirable that they be symbolized in some form on 

 the charts. However, since several symbols are available for depicting relief a study shall be 

 made for each chart and the proper symbol to use will be noted in the Specifications. 



BLUFFS AND CLIFFS 



muc 



HIGH, NOT ROCKY 

 (BLUFFS) 



ROCKY 

 (CLIFFS) 



LOW, NOT ROCKY 

 (BLUFFS) 



CONTOURS 



CONTOURS (Fig. 1) (C-1, -la) 



On charts where contours are to be shown, the contour interval shall be noted in the 

 Specifications. The interval shall be uniform on any one chart, but to bring out a summit or 

 an important feature, an intermediate interval may be shown by a dashed line. 



For charts to which gradient tints will be added, the interval selected shall be wide enough 

 to show clearly the gradations of the color tints. See charts 5111, 5112, 5114, 5115, and 6102. 



Contours shall be delineated by a .004" line with every 4th or 5th contour (index contour) 

 accentuated by an .008" line. 



To give the navigator a general and easily interpreted picture of the relief, contours shall 

 be generalized. The degree of generalization depends on the nature of the terrain and the 

 scale of the chart. (See pg. 45.) 



The contour values shall be in slanting figures placed at suitable intervals parallel with, 

 and centered on, the accentuated fines. (C-1) Li flat areas where no fines are accentuated, 

 contour values should generally be shown on every line. (See pg. 45) 



On small-scale charts without contours, mountain or hiU summits shall be represented by 

 a dot surrounded by hachures. (D-Db) 



