Table C-6.--List of chart squares occupied by a research vessel off Alaska (Area III) in May 1968, 

 showing hours in square, seals seen per hour, and number of seals seen and collected 



^The base chart is USCGS no. 8500. The side of each chart square measures 18.52 ton. (10 nauti- 

 cal miles); a square covers an area of 343 km. ^ (100 square nautical miles). Squares are located 

 by a system of vertical and horizontal numbers. Horizontal numbering begins at the lower right 

 comer of the chart (fig. 14) and vertical numbering at the lower left comer. 



103 



