Length overall

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[1] (for example, £2.50 per metre LOA).

[7][8] In ISO 8666 for small boats, there is a definition of LOH, or length of hull.

[9] This may be shorter than a vessel's LOA, because it excludes other parts attached to the hull, such as bowsprits.

In some cases (particularly old yachts or vessels with bowsprits) LWL can be considerably shorter than LOA.

LOA (length overall) & LWL (waterline length)
Detailed hull dimensions