Good morning. I am going to start a new part of this course, basically connected to what we call sea keeping and ship motion in waves. We will be talking about sea keeping and ship motion in waves. So, these first two lectures I have termed as regular ocean waves, but before I go to that, I would like to give a brief introduction to what part of this performance of marine vehicles that we are going to talk. See, this, what sea keeping and ship motion essentially implies, if there is a surface wave and the ship moves, how it behaves in waves and all the attendant factors.