Before revision: The circle is divided into sixteen equal parts defining a hexadecagon, then the network of sailing directions "for a 16 winds rose " is represented by groups of 16 "straight lines" called rhumblines .
After revision: The circle is divided into sixteen equal parts defining a hexadecagon, then the network of sailing directions "for a 16 wind roses " , placed in the 16 vertex of an hexadecagon, is drawn in groups of 16 "straight lines" called "rhumblines" (on 13th-century charts)set of .