Not trying to rain on anyone's parade here, but are you sure you have TMO installed correctly?
BTW, if you're looking for U-Boats, I sank one in the Formosa Strait, mid or late 44. Got a message about it's transit there too.
I just sank my first Jap sub in open waters, early 42 in the Flores Sea. It was heading NNE toward the Molucca strait.
