Length overall of a vessel
Length overall (LOA) of a vessel means the centerline longitudinal distance, rounded to the nearest foot, measured between:
(1) The outside foremost part of the vessel visible above the waterline, including bulwarks, but excluding bowsprits and similar fittings or attachments, and
(2) The outside aftermost part of the vessel visible above the waterline, including bulwarks, but excluding rudders, outboard motor brackets, and similar fittings or attachments (see Figure 6 to this part).
50 CFR § 679.2
In addition to the definitions in the Magnuson-Stevens Act and in part 600 of this chapter, the terms used in this part have the following meanings: