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Just checked the route you probably took. It seems impossible to get back onto the same ship to Calcutta after taking its Waltair->Madras leg. Not...
A minor update to my map posted a short while earlier. Fixed a little inaccuracy near Athens, Irkutsk and Urga. Here you go: Map v1.1...
A map compiled by myself after many playthroughs of the game: Map link...