Page 743 the smooth sheet 7847 



7847. Cable Crossings 



The shore ends of submerged cables shall be shown on the smooth sheet by dash 

 pencil Imes indicating the general direction of the cable. Each end should be marked 

 "submerged cable" (see fig. 171). 



785. Symbols for Smooth Sheet 



The symbols to be used on the smooth sheet are generally those used on the charts 

 which are illustrated in figure 189. It is not necessary that the symbols on the smooth 

 sheet be as perfect as those on the charts, nor that the drafting be as artistic (see 721) . 

 Slight modifications in the direction of simplicity may be made, the important thing 

 being that they convey the information neatly and unmistakably. 



There are certain exceptions to the use of chart symbols for smooth sheets, and 

 these have been discussed in detail in preceding paragraphs. Examples of this diver- 

 gence are the depth curves, which are shown in color on the smooth sheet but are sym- 

 bolized on the charts; and lights and beacons which are almost invariably shown by 

 their station symbols rather than by the chart symbols. 



Figure 169 illustrates the symbols and lettering to be used on the smooth sheet, 

 which differ from the symbols used on the published charts. 



786. Miscellaneous Data 



In addition to those mentioned heretofore, as many of the following details as have 

 been obtained by the field party shall be shown on the smooth sheet. They should be 

 left in pencil unless otherwise noted, to be subsequently inked at the Washington Office 

 after verification. 



7861. Tide Rips 



These occur in places where strong currents are found and are usually encountered 

 in the vicinity of shoals or where the bottom is uneven. A knowledge of these is of 

 importance to the mariner and they should be shown on the smooth sheet either by 

 legend or by symbol and legend, and qualified as heavy, moderate, or light. Where the 

 feature is extensive, the approximate limits should be outlined and an appropriate 

 descriptive note added. 



7862. Breakers and Shoal Areas 



The limits of breakers, whether offshore or alongshore, should be shown by a dash 

 line with the notation "breakers" added. Wliere cuts are taken to single breaks, their 

 intersection should be indicated by the sunken-rock or rock-awash symbol, as the case 

 may be. If there are no rocks, the spot should be encircled with a broken line enclos- 

 ing the word "breakers". 



Shoal areas covered at the sounding datum, over which sounding lines have not 

 been run, should be outlined with a dash line within which the estimated depth is 

 inserted. 



The low-water limits of shoals, bars, mud flats, sand banks, etc., that bare at the 

 sounding datum but which have not been accurately surveyed, should be taken from 

 the best available source and shown on the smooth sheet in accordance with 754. The 

 estimated height above the sounding datum should be given if available. 



