This presentation will focus on the topic of Ship Underactuation in ocean going vessels. The subtopics of this presentation consist of Rigid Body In Equilibrium, The Center of Gravity in a Rigid Body, Applying a Force into the Rigid Body, Acceleration in the Rigid Body, Translational Acceleration in the Rigid Body, Moment in the Rigid Body, Rotational Acceleration of the Rigid Body, Applying an Opposite & Equal Force, Applying an Opposite & Equal Moment, Applying an Opposite & Not-Equal Force, Applying an Opposite & Not-Equal Moment, What is a Fully Actuated System, What is an Underactuated System, and Ship Underactuation.