A traditional unit of distance equal to 1000 yards (exactly 914.4 meters). This unit is used in the U.S., British, and Commonwealth navies in describing ship distances and target ranges
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}