A.Effect of the propeller flow on the rudders
B.Water flow due to the vessel's movement through the water
C.Tunnel affect of the water flow past opposing rudders
D.Discharge current being channeled to impinge on the vessel's deadwood

A.wooden blocks or dunnage placed between a deck load and the deck
B.the chains and shackles used to secure a deck cargo
C.a crate in which a deck cargo is packaged
D.cardboard separation pieces placed between deck loads to prevent chafing