A line of sargassum weed running parallel to the inshore edge of the Gulf Stream at 

 40° N., 63° W. There is usually an abrupt change of velocity of half a knot or so on 

 both sides of a weed line such as this. Often there are a number of such lines, and 

 corresponding velocity steps, along the inshore edge of the Stream. The vessel is about 

 300 feet long. This aerial photograph was given to me by Commander William Kielhorn, 

 United States Coast Guard Reserve. 



