The "MTM Potomac" is a 180 meter tanker, without a thruster and a fixed pitch, right handed propeller (like most).
This particular maneuver consisted of backing her about a ship´s length, then swinging to port with the help of 2 ASD tugs.
This video explains what is a Marine Notice and discusses the recently issued (2019) marine notice regarding pilot transfer arrangements.
Mariners appearing for oral examinations will benefit from watching this video.