CSs of navigator working on his marine charts on bridge of Fisheries Canada command ship "Tanu" on Barkley Sound before official opening of herring fisheries (17 ft). CU of schools of herring visible on screen of sonar (52 ft). CS sideview of officer consulting sonar, cut to rear shot of same, ZOOM IN to CU of screen (38 ft). POINT OF VIEW SHOTSs from bridge of ship (22 ft).