The normal work of the Coast and Geodetic Survey, carried on throughout the United States and its possessions, includes (1) surveys of the coastal waters and adjoining land areas; (2) observation, study, and prediction of ocean tides and currents, and of the earth's magnetic elements; (3) geodetic control surveys and related gravity and astronomical observations; (4) production of nautical and aeronautical charts; and (5) seismological observations and investigations. These activities provide information essential for water and air navigation, for mapping, and for many other strategic...