RULES AND PRACTICES 15 



III 

 General Instructions 



BASIC REQUIREMENTS 



Accuracy of position, legibility, and uniform consistency in selection and placing of names, 

 notes, and other details on the charts, are the chief requirements in nautical chart compilation. 



New or revised charts are not ordinarily smooth drafted in the Nautical Chart Division. 

 Special charts, for which there is an urgent need, are smooth drafted for direct reproduction. 

 They are referred to as PROVISIONAL CHARTS and are so labeled in the title. These 

 charts will be engraved in the Reproduction Division when time permits. A chart constructed 

 from unverified information wUl be labeled PRELIMINARY CHART. 



Compilations and Drawings of charts which are not smooth drafted must be kept reason- 

 ably clean. Lines and figures must be sufficiently bold to photograph well. 



The selection and placing of names is the responsibility of the cartographer. For this 

 reason, all compilations, before being forwarded to the Reproduction Division, should include 

 all type necessary to the final chart. 



Compilations of new or reconstructed charts must be drawn in black ink, except that the 



geographic names and the position intersections and descriptions of aids and landmarks should 



be shown in blue as a guide for the application of the printed type. When a type overlay sheet 



"is used, the Reproduction Division paints out unimportant detail on the black base negative 



to clear for type. 



When starting a new chart, or making extensive revisions to an existing chart, it has been 

 found advisable to plot first all landmarks and fixed aids to navigation. Then a ready check 

 of their plotting can be made by comparison, if the positions of such aids are indicated on 

 pantograph reductions, film positives, or any other reductions of the survey sheets necessarily 

 made for use in the construction of the chart. 



CORRECTIONS TO DRAWINGS 



Corrections must be applied to all charts aflfected in the order of their scales. The cor- 

 rections should be made first to the Drawing for the largest scale chart. It is the responsi- 

 bility of the cartographer to follow this procedure unless otherwise ordered by the Chief of 

 Branch. 



When making erasures on Drawings, care must be exercised to see that no more of the 

 printed chart is removed than is to be replaced by new work. Erroneous erasures must be 

 redrawn in black ink. Failure to observe this will cause unnecessary recutting on the negatives. 



