Rösing was then stationed on  (17 April 1929 – 31 October 1929) before he was appointed company officer with the 2nd department of the standing ship division of the Baltic Sea on 1 November 1929. During this assignment he was promoted to Oberleutnant zur See (First Lieutenant) on 1 April 1930.
Rösing occupied a role from  (17 April 1929 – 31 October 1929), prior to being appointed company officer with the 2nd department of the Baltic Sea's standing ship division on 1 November 1929. He was subsequently promoted to Oberleutnant zur See (First Lieutenant) on 1 April 1930.