Air navigation chart V30 (series). 26. Lat 29° N.-45° N., long. 60° E. Scale 1″ =30 naut. m. (1:2,188,800) at lat. 3 7° 30′, contour interval 1,000, 2,000. 3,000, 5,000, 7,000, 9,000, 12,000 and 15.000 ft.