You will recieve a renown bonus when you start your career as Pisces mentioned. If you are using GWX, any upgrades made to your U-boat except your U-boat emblem before you complete your first patrol sometimes can cause the game not recognizing the ships renown you earned during your patrol.

Welcome aboard Kaleun Naga, others have already beaten me to the points I would have made, welcome to the friendliest, most helpful community on the web. Any questions you have (and you will !), feel free to ask here. It will become easier, ( and harder ! ) as you go along.:salute: