Amos. when I left school at sixteen (1969) Logarithms was a birth control method for trees; and Calculus grew on yer teeth if you did'nt brush em.. There are many books that describe the length, breadth, and depth of the Gulf stream. Nasa tracks and advertises its major axis (by infra red satellite imagery) so that poor mariners like me can avoid it southbound and use it northbound, for practical navigation purposes; we saved a half day on the return voyage by following the major axis.. Good luck mate I could'nt even start helping ye calculate that lot. Yours, Aye. Dave