OLC I watched your video (above) so correct me if i am wrong.
In GWX one could use the 10X periscope to approach a convoy as well as attacking it. An Ubermod user though should/could use his 3X periscope for attacking purposes (mainly) and do a lot of hydrophone checks in order to approach it.(?)
I hope you don't go like
in frustration after reading this.
Great mod by the way.