Air navigation chart V30 (series). 41. Lat. 14° N-30° N, long, 103° E-75° E. Scale 1″=30 naut. m. (1:2,188.800) at lat. 22°30′, contour interval 1,000, 2,000, 3,000, 5,000, 7,000, 9,000, 12,000, 15,000, 20,000, and 25,000 ft.