Now, there is one thing that is very important, that also I will talk is that although I say this procedure is simple, there is one pitch here, this is omega this is S omega. However, you see this is what is omega, this is as you observe the waves from a fixed reference point because you have taken the record at a fixed point, but ship is moving.
So, the all those irregular wave what the ship sees, each one see, this one is broken down to number of waves, but the ship that the same wave would feel to the ship to be something else, because this omega will feels to be this omega i will feel at omega e i this omega I will be feel as omega e i. Because, supposing this is composed of let me give an example, a 10 second wave plus a 12 second wave plus a 14 second wave. For the 10 second wave, when the ship is moving at 20 knots, we will feel like an 8 second wave the 12 second wave if we feel like something else. So, first of all although I said that this has to be transformed initially to how the spectrum would be if you are on the ship or as the ship would feel it ok.