Oh woe and misery. Was on an early-war patrol out of Kiel in my trusty IIA when I realised I'd be cutting it too close to make it back home. Stopped off at Wilmshaven for a refuel and, since they'd topped up my supply of torpedoes, decided to mooch back to Dover to see what I could find.
Sunk one troop transporter, one large and one medium cargo ship, returned to Kiel and... ZERO RENOWN.
Is this the way it goes, if one ventures on a 'NUL grid' patrol?