Weib Pinguin, Hit the nail on the head as usual

, there has been a couple of posts about this lately.
Do as Fluffly Sheap Suggests and follow one of the 4 protocols he mentions. You will lose renown for sinking the target ships but the 7th Flottila does get more starting renown than any other Flotilla because of this, as already mentioned.
As you will find out if you hang around out on your first patrol till the 4th August as mentioned in your initial first patrol orders, Being in the 7th Flotilla at the start of your career in August 1939 does not last long anyway.
But it is good practice for your crew on the deck gun and manual targetting the Torpedoes just before the start of the war.
Good Hunting U-48Kriegsmarine