AIDS TO NAVIGATION 



79 



The characteristics and numbers of all lights must be shown on the Compilation in blue, 

 and on the Drawings in red, and must be in the exact positions they will occupy on the finished 

 chart. The lower case "1" is used in the abbreviation for flashing, Fl. Two lights on the same 

 structure should be so indicated by their characteristics even though these are the same, 

 e.g.lnR. Amber lights are indicated by the abbreviation "Am." The words and abbrevia- 

 tions for visibility and every, vis., and ev., are to be omitted from the charts. The visibility 

 distance of range lights shall not be charted. 



On large-scale charts, the characteristics of lights shall be shown in the following order : 

 1. Character as Gp Fl group flashing 



The legend will appear on the charts thus : 

 Gp Fl R(3) lOsec 85ft 10M"2" 



Omissions shall be made on the smaller scale charts in the following order: 



1st height, 85ft 



Gp Fl R(3) lOsec 10M"2" 



2nd period, every 10 seconds 

 Gp Fl R(3) 10M"2" 



3rd number in group, (3) 

 Gp Fl R 10M"2" 



4th number, "2" 

 Gp Fl R lOM 



5th visibility, lOM 

 Gp Fl R 



On small-scale sailing charts, complete information regarding characteristics should be 

 liven for those lights which it is anticipated will be used in coastwise navigation. 



Names of lights which are not numbered should be charted when space permits. 



692-834 O - 64 - 7 



