Gosh, nothing in the North Sea
??
I usually have trouble navigating anywhere because there's merchants contstanly obstructing me...
My suggestion, find Aberdeen and loiter while listening to your hydrophone about 50km ENE from there...
Or you could find one of those estuaries and patrol those, Firth of Forth is OK, so is the Thames estuary
generally the closer you are to the British coast the more shipping, the only downside is spiky boom-balls as demonstrated in the screenshots thread at the moment, oh and shallow water...
