Explanation:
Length overall (LOA, o/a, o.a. or oa) is the maximum length of a vessel's hull measured parallel to the waterline. ... It is the most commonly used way of expressing the size of a ship, and is also used for calculating the cost of a marina berth (for example, £2.50 per metre LOA).
The Breadth of a vessel was the widest part of the hull, measured from the inside of the shell planking or frame face. This is why it is called the "Half-Breadth Plan", because the lines drawing would be to the outside face of the frame that would be lofted, the shell applied after the frames were setup.
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