The monthly resultant current speeds in ten segments of the Gulf Stream System are calculated from surface current data published by the U. S. Navy Hydrographic Office. Marked annual variations in the current speeds are found in the Florida Current, in the Caribbean Sea, and in the Trade Wind areas. In other segments of the system the annual variations are not so well defined. The maximum current speeds occur during the summer in the southern segments of the Gulf Stream System and during the winter in the northern segments. The minimum speeds occur during the fall months throughout the system....