This was where new U-boat crews received their tactical training (Taktische Ausbildung Unterseeboote), also taking part in an eight- to fifteen-day tactical exercise (Taktische Übung), a simulated convoy battle in the Baltic Sea. A U-boat might have to take part in more than one exercise, for example U-109 needed two attempts in the spring of 1941, before being declared combat ready. The flotilla was the last training station for new U-boats.