Radar does make things easier when closing in on ports, since although challenging as the game may be, its a fact that some things are predictable. For instance, as there may be escorts or subchasers or gunboats on dock, they WILL NOT depart to chase you. They might (95% of the times) star shooting at you. So if there is fog and you start attacking, there is an almost 100% chance that you can do that surfaced and with little or no risk of being attacked. Also, since nobody can see you, I think nobody is going to radio anybody that you're there.
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