Air navigation chart V30 (series). 53. Lat. 1° S-15° N, long. 51° E-26° B. Scale 1′=naut. m. (1:2,188,800) at lat. 7°30′, contour interval 1,000, 2,000, 3,000, 5,000, 7,000, 9,000, 12,000, and 15,000 ft.