Nuclear weapon
Following World War II, the Coast and Geodetic Survey resumed its peacetime scientific and surveying efforts. In 1945 it adapted the British [[Royal Air Force]]s [[Gee (navigation)|Gee]] [[radio navigation]] system to hydrographic surveying, ushering in a new era of marine electronic navigation. In 1948 it established the [[Pacific Tsunami Warning Center]] in [[Honolulu]] [[Hawaii]]. The onset of the [[Cold War]] in the late 1940s led the Survey also to make a significant effort in support of defense requirements, such as conducting surveys for the [[Distant Early Warning Line]] and for [[rocket]] ranges, performing oceanographic work for the U.S. Navy, and monitoring [[Nuclear weapon|nuclear]] tests.