Where do you get your info?
I have seen this about single ship contacts before, and the same question comes to my mind.
What is the big deal?
Ships, either submarines, or surface ships, get contacts for whatever enemy vessle is spoted. If some kinda of intel said that at a ship was leaving port, there would such a contact message sent out to the subs of surface vessles.
Yes, convoys were more important, but remember, it was one lone ship that carried the attomic bomb to tinian island. Single contacts could potentially be more important than an entire convoy, if you really think about it.
You have to remember there were other subs out there, and they may also send out a contact message concerning the ship and its nationality. Ex. Have spotted 6000 ton steamer, in grid AK22, DO NOT ATTACK CONTACT, vessle is flying sweedish flag." These kinds of contacts were sent all the time, it is just not well simulated in SHIII.
Personally I like single ship contacts, cause they are easy pickings, unlike convoys which have destroyers and other nasty escorts around them.
Don't worry, later in the war, single ship contacts are a rare and welcome thing. Convoys get bigger, and much better defended.
Also, rmember this is a simulator, that if played completely realistically would take whole weeks of your life, which frankly would be quite sad. Without those single contacts, you would spend most of your patrol waiting for the rare convoy report.
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