SH1 had a system that the convoys pretty much "stayed the course" that was initially reported. SH4 is not like that. If you're looking for something to sink, you're better off finding a "shipping lane" and staying there. Somewhere between Formosa and the Philippines, in the Luzon Strait, is usually pretty active. Think of Japan after raw resources in the Dutch East Indies, and draw a line from there to Japan.
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