Perpendicular, After

Perpendicular, After is a term used in naval architecture to describe the point on a ship's hull where the after perpendicular intersects with the waterline. The after perpendicular is an imaginary line that runs vertically through the ship's stern, while the waterline is the level at which the surface of the water meets the ship's hull. The point where these two lines intersect is an important reference point for determining the ship's length overall (LOA), which is a key measurement used in ship design and classification. The LOA is typically measured from the forward-most point on the ship's hull to the point where the after perpendicular intersects with the waterline.
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