Long range air navigation chart, V70 (series). 11. Lat. 3°N-57°N, long. 48°W-92°W. Scale 1″ = 70 naut. m. (1:5,107,200) at lat. 30°N, contour interval 1,000 3,000, 5,000, 7,000, 10,000, 15,000 ft.