LOA : Length Overall (LOA)is the length measured between the extreme ends of the ship from forward to aft.
LWL : Length at waterline (LWL) is the length measured at the existing waterline, from forward to aft ends of the ship. It varies with the draft of the ship.
LBP : Length between perpendicular(LBP) is the length measured between the FP and AP of the ship. It is used in stability calculations.
SLWL : Summer Load Waterline (SLWL) is the waterline at which the ship is floating at even keel upto the summer load line in salt water of RD 1.025.
FP : Forward perpendicular (FP) is a vertical line passing through the intersection of the SLWL and the fore side of the stem of the ship.
AP : Aft perpendicular (AP) is the vertical line passing through the intersection of the SLWL and aft side of the rudder post or the center of the rudder stock, if rudder post is not fitted.
Midshipman : Midshipman or amidships is the vertical line passing through the midpoint of the LBP.
Breadth : Extreme breadth is the maximum breadth measured between the outside of the shipsides. Moulded breadth is the maximum breadth measured at midshipman between the inner sides of ship side plating.
Depth : Extreme depth is the maximum depth measured along the centreline of the ship from the bottom of the keel to the top of the uppermost deck.
Draft : Draft is the vertical distance measured along the shipside from the bottom of the keel to the waterline.
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