Limnoria (commonly known as the 'gribble') is a small isopod crustacean marine wood borer. It tunnels into the superficial layers of wooden boat hulls, pilings, and harbor jetties using its mandibles, ingesting cellulose and degrading marine timber.

The FAO's International Standard Statistical Classification of Fishing Vessels by Vessel Types (ISSCFV) categorizes fishing vessels primarily according to the Main Fishing Gear Used on board (e.g., Trawlers, Purse Seiners, Gillnetters, Longliners, Trap Setters, Dredgers, and Multipurpose Vessels).

One international nautical mile is defined as exactly 1,852 meters ($1.852\text{ km}$), corresponding approximately to one minute ($1'$) of latitude along any meridian on Earth ($1\text{ NM} = 1.15078\text{ statute miles} = 1.852\text{ km}$).