A unit of distance used in radar technology. The data mile equals exactly 6000 ft or 1828.8 meters; this is equivalent to about 1.137 statute (ordinary) miles or 0.9875 nautical miles. U.S. military radar equipment is often calibrated in data miles
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}