Map #76: Monsoon and Trade Wind Chart of the Indian Ocean, 1864

north-easterly monsoon of the winter is characterised by dry, steady, relatively gentle winds

outh-westerly summer monsoon is wet, violent and characterised by storms and strong wind with sailing only feasible at the beginning and end; in the late spring and early autumn. Unlike in the Mediterranean and Northern Europe, then, sailing in the Indian Ocean tended to avoid the summer months of June, July and August.

the Somali Current and western Arabian Sea (Section 4), and the Bay of Bengal, seasonally reversing monsoon currents south of India and Sri Lanka, and the eastern and central Arabian Sea

Part of Indian Ocean appearing in Maury’s map. The map stops north of Cyclone Alley between Australia and Madagascar. This area appears twice on Maury’s map.