(See pages xxxiii, xxxiv, xxxv)
FROM a very unpretentious beginning, the utilization of aircraft in hydrographic surveying has developed until is the policy of the Hydrographic Office of the United States Navy to profit by all of its possible applications. By thus using aircraft and aerial photographs to the fullest extent the cost of a survey, in both time and money, is considerably reduced, and, in addition, a superior product is obtained.
For a number of years the value of aerial photographs for the purpose of hydrographic surveying was questioned. About 1916, the value of such photographs was definitely established and an endeavor made to obtain some for experimental purposes. Unfortunately at this time the Aeronautical organization of the Navy was extremely small and fully occupied with other and more essential military duties. For these reasons it was not until after the World War with its consequent expansion of the aviation activities of the United States Navy that planes or pilots became available.