You may have to draw your desired section upside down to get it to orient correctly. If you haven't already played with Modelling>Move>Reverse Normals, you should try that first.
Marine Engg is most specifically the powering and mechanical operation of ships (inside of boats). Naval Arch can be defined as the structural and hydrodynamic performance prediction of ships (outside of boats). Ocean Engg is most specifically the study of the effects of the marine environment...