I don't know what The Reich's take is on it .... and I don't know what other Captains do ... I can only tell you what I do ...
I am the Captain of my vessel ... when I park off the Englander's coast ... and they are heading for it ... as far as I am concerned ... they are one of three types ... an enemy, a neutral, or an ally.
If an enemy, then my decision is made. LOS!
If a neutral, then they should know better than to enter a war zone. LOS!
If an ally, then there is only two reasons to be steaming to England ... they are traitors ... LOS!
or .... they are stupid and shouldn't be allowed to represent the Kriegsmarine. LOS!
Seriously though, make your best guess ... I can't see them either.