Head 06 : A vessel toilet. The name is believed to have come from the fact that the toilet facilities on sailing ships were located in the bow (head) of the vessel.
Association of Marine Underwriters of San Francisco (AMUSF), Glossary of Marine Insurance and Shipping Terms, http://www.amusf.com/Definitions_A.htm, CA, USA 2011. (Mrtm Insur and Shipping - Amer) {575}
