Erna was an 865 GRT coaster that was built in 1922 by Howaldtswerke, Kiel, Germany for German owners. She was seized by the Allies at Kristiansand, Norway in July 1946, passed to the Ministry of Transport (MoT) and renamed Empire Confederation. In 1947, she was sold to Cyprus and renamed Troödos. In 1952, she was sold to Costa Rica and renamed Burica, then another sale in 1953 saw her renamed Dmitris. In 1955, she was sold to Panama and renamed Cedar.