Rummy, Too funny. I assume you know what a rhumb-line is. Looks like Michael's spelling is becoming standard. Bill Effros Robert Skinner wrote: >R22RumRunner at aol.com wrote: > > >>Michael, >>What's a rumline? >> >> > >Rummy, see >http://www.atlantickayaktours.com/pages/expertcenter/Navigation/Navigation-12.shtml > > >