Under 'Misc' select the radio and pull it with your mouse, there's a map attached to it wich gives you the shipping lanes.
Obviously you'll need to figure out when those lanes go active.
For example, you won't find any cargo vessel or convoy en route to Singapore before the Imperial Navy take it, same goes for Manilla, Java and so on.
One tip: after ending a patrol, when starting a new one, you get a full map cut-scene with IJN movements. If a area has bin taken you'll find traffic a few day's / weeks after on those shipping lanes.
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