From what I know about it when you send a contact report and you are within range of a Lutwaffe base or there are German warships in the vicinity then they will come to the position you sent.
I suspect that there is actually a percantage chance of them turning up somewhere in a file that determines whether they do or not. I can say that I have seen both air and see forces attack a target that I have reported. It certainly doesn't always happen but the closer you are to an airbase the better the chances of them turning up in good time. I assume the air units have to scramble from the airbase and they travel at the speed they travel so the further away you are the longer it will take.
Keep trying it and see what happens. It certainly won't help in mid atlantic or on the US coast as unless there is a German naval unit close by you are on your own.
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