Q. 



Soundings 



27 



No bottom sounding 



Dredged channels 



(controlling depth 



- 1^----'-!. '"ay be shown in 



separate note) 



Swept areas (shown 

 by green tint) 

 (not yet covered by 

 sufficient hydrogra- 

 phic surveys to show 

 adequate soundings) 



(16) =6: 



Str. 



i , Tides and Currents 



(la) 



2 

 (2a) 



3 



4 



(Sa) 

 (8b) 

 (9a) 

 (9b) 

 17 

 18 



19 



20 



23 

 24 



(25) 



Current Diagram 



xv. Depth Contours & Tints 



Feet 





 6 



12 



18 



24 



30 



36 



60 



120 



180 



240 



300 



600 



1.200 



1.800 



2.400 



3.000 



6.000 



12.000 



18.000 



Or lO fath 

 greater 



Fathoms 



O 



/ 



2 



3 



4 



5 



6 



10 



20 



30 



40 



50 



100 



200 



300 



400 



500 



1.000 



2.000 



3.000 



oms and 



JO - 



Or 100- 



FlGURE 189. — Symbols and abbreviations for nautical charts (part X). 



