Abstract
A large ocean liner was confronted with severe weather in the central Indian Ocean. Meteorological information received on the bridge contradicted observations on board. A near-catastrophic event required emergency measures while correct weather data were requested. Fundamental principles of climatology helped clarify the synoptic situation and for a period of seven hours guided the decision-making on the bridge. The area of occurrence is not well served by weather stations; previous emergencies have had fatal consequences. Sea as well as air transport across this zone is affected. Unexplained events give rise to notions of a Garcia Quadrangle here.

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