AB 4 : Able Bodied Seaman. In the British nautical hierarchy after some time at sea a seaman can take an examination for EDH (Efficient Deck Hand) and then after further years at sea can be formally qualified as an AB
www.shipsandoil.com (originally www.mmass.co.uk a website set up bring to the notice of the world the presence of Marex Marine Services by featuring details of supply vessels from all over the world), Glossary of Terms - Ships and Oil, Aberdeen, UK 2012. http://www.shipsandoil.com/features/Glossary%20of% 20Terms.htm, (Mrtm/ Ships and Oil) {582}