MLS of frigates of the Canadian Navy at sea (2 shots; 0:41). CU of sonar screen (1:03). Boating shots of HMCS Saguenay at sea (3:07). CS of ship's clock (0:06). AERIAL SHOTs of ship at sea (2:33). POINT OF VIEW SHOT from bow of ship of convoy at sea (0:32). MS of air search radar (0:04).