Air navigation chart V30 (series). 11. Lat. 44° N-60° N, long. 79° W-121° W. Scale 1 in.=30 naut. m. (1:2,188,800) at lat. 52°30', contour interval 1,000, 2,000, 3,000, 5,000, 7,000, 9,000 and 12,000 ft.