I know that you should know the formula that I have written, express each term of it as it is expressed. I don't know if you become ignorant, with the stupid idea of discrediting me, or if you really are to the extreme that I couldn't imagine.
It is not worth talking to you because, apparently, you are not able to understand the basics. I am not going to waste any more time to show you what, apparently, despite being a naval architect, you are unable to assume.
But, speaking about the post #2, why do you tell the OP that he should estimate the value of GM ?. What for?, Could you, please, with your perfect English, explain it? Or is it a blunder when talking about what you don't know?