92 NAUTICAL CHART MANUAL 



CHART DETAIL to include: 



1. Landmarks and other navigational aids shall be precisely plotted. 



2. Urban area limits are selected from latest sources, outlined on an urban compilation 



and show the actual urban limits and not the city or town boundaries. The urban 

 pattern will be screened by the Reproduction Division. 



3. Main roads and railroads shall be single line, identified, labeled and show through the 



urban pattern. All roads leading to facilities must be shown. 



4. Drainage patterns, lakes, streams, canals, and reservoirs are charted when significant. 



5. Selected critical spot elevations and bluffs should be charted if prominent. 



6. Latest bridge and cable data shall be applied. 



HYDROGRAPHY is to be compiled from latest sources. Hydrographic information on the 

 base charts within the limits of the insets is omitted except for that used for through traffic. 

 Soundings shall be carefully selected and charted in feet, or fathoms and feet, as required. 

 The 6-foot, low-water, and/or other critical depth curves are selected. A blue tint shall be 

 shown to the 6-foot or critical depth curve. 



Low water areas are tinted green and outlined by a dotted curve. 



Reefs, rocks, shoals, wrecks, piles and other water obstructions shall be carefvdly plotted. 



Bottom characteristics shall be carefully selected and spaced. 



All channel limits and notes are placed on the black Compilation. 



Restricted, prohibited, cable and pipeline areas shall be verified and applied to the red 

 or magenta Compilation. Restricted areas are shown by the "TTT" symbol. 



MAJOR COURSE HEADINGS are shown on the red or magenta Compilation, and appropri- 

 ately labeled. 



MAJOR DISTANCES are international nautical miles and given between primary course 

 changes and/or at marked five mile intervals on the red or magenta Compilation. 



