Variation of Area of 1 ° Quadrangles with Latitude 



Latitude C) Approximate 



Area of 1° 

 Quadrangle 



(nautical miles ) 



3,768 



10 3,534 



20 3,377 



30 3,118 



40 2,763 



45 2,555 



50 2,324 



55 2,079 



60 1,813 



65 1,533 



70 1,241 



75 941 



80 631 



85 317 



89 63 



90 



62 



