Watch 01 : (1) One of the periods (usually 4 hours) into which a day is divided. (2) A particular duty, as lifebuoy watch. (3) The act of a buoy or other marker in indicating the position of a sunken object
Compass (The National Training Portal of The U. S. Naval Sea Cadet Corps), appendix I, Glossary, VA, USA 2012. http://compass.seacadets.org/pdf/nrtc/bmr/14325_in d.pdf, (Mrtm/Nav - Amer) {558}