Naval Architects and Marine Engineers use 3D hull models, hull line, or hull offsets, to product stability booklets and documentation. Some vessels that lack up todate lines plans or offsets. Vessels may have undergone modifications/repair,after completing the modification/repair the existing lines plans or offsets may not have been updates so are unreliable for Tonnage and Stability calculations.
While a vessel is dry-docked, 3D Measure can laser measure the outside of the hull and deck, collecting "As-Built" data. This data is then turned into an "As-Built" 3D surface model. Naval Architects and Marine Engineers using the "As-Built" 3D model together with other data to produce a stability booklets, and other documentation which can be submitted to the US Coast Guard.
USGC have four main types of Tonnage and Stability Measurements • Convention Measurement (46 CFR 69, Subpart B) • Standard Measurement (46 CFR 69, Subpart C) • Dual Measurement System (46 CFR 69, Subpart D) • Simplified Measurement System (46 CFR 69, Subpart E)
More information may be found at www.uscg.mil or a Naval Architect at www.sname.org
