Question

what is it called when a vessel moves side to side in a stern tow? catenary set yawing drift

Explanation:

In maritime terminology, yawing refers to the side - to - side oscillation or movement of a vessel, especially in a stern tow situation. A catenary is the curve of a suspended cable, set is related to the direction of a current's effect on a vessel's position, and drift is the overall movement of a vessel due to external forces like current, not the side - to - side movement in a stern tow.

Answer:

Yawing (the option with the blue dot, i.e., the third option: Yawing)