Air navigation charts V 30 (series). 55. Lat. 1°S-15°N, long. 103°E-78°E. Scale 1″ = 30 naut. m. (1:2,188,800) at lat. 7°30′, contour interval 1,000, 2,000, 3,000, 5,000, 7,000 and 9,000 ft.