Table C-3. — List of chart squares occupied by research vessels off 

 Washington in February 1967 , showing hours in square, seals seen 

 per hour, and number of seals seen and collected 1 — Continued 



V The base chart is U.S. C.G. S. no. 5002. A chart 

 square forms an area of 343 square kilometers (100 square 

 nautical miles). The side of each measures 18. 52 kilometers 

 (10 nautical miles). Squares are located by a system of vertical 

 and horizontal numbers. Horizontal numbering begins at the 

 lower right corner of each chart and vertical numbering at the 

 lower left corner. 



93 



