Fortuitous accidents or casualties, peculiar to transportation on navigable water, such as stranding, sinking, collision of the vessel, striking a submerged object, or encountering heavy weather or other unusual forces of nature
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}