If I'm not mistaken the "ticking" noise is actually when you reach a waypoint set on your navigation map. It get's real annoying when you're going through Kiel lol.
As far as dock vs. refit... Well I refit. After reading about some of the 150+ day patrols some of the real U-Boat commanders had I figured going out for a month then spending time in dock was just about as unrealistic as the refit times lol
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