What is the meaning of easily stalked in the following text?

Their freighters were perpetually overloaded, slow, outdated, easily stalked, and unmarked.



I googled and found that the reference is to Japanese ships during the Second World War. It means that those ships (freighters) could easily be tracked (stalked) by enemy forces (e.g. navy boats).

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Thanks for the reply and your effort to find the context. Yes this is exactly the case, and the text is from the book The Reckoning written by John Grisham. I highly appreciate your attention.

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