SHIP HANDLING in Following Seas 

Nice video useful information for mariner.

Captain: Helmsman, adjust the encounterwave period, so that is does not coincide with one half of the natural rolling period of the ship! Helmans: Aye Sir (prcoeeds to adjust the encounterwave period)

So basically in a following sea, slow down, alter course if possible

To stop the parametric rolling, you could also increase GM thus speeding up the roll period. So that the right way of thinking about it?

How does a sailing vessels deep keel and ballast affect these formulas?

Hello how on earth do i Read the Diagram of Encounter waves,,, Explain

Increase size and length of Bilge Keel Plate.