For tariff purposes, the relevant measurement is the overall hull length as stated in the vessel's technical documentation or builder's certificate. Importers should obtain the manufacturer's certified length specification, since the 7.5 m and 24 m thresholds determine which subheading applies and can affect the applicable duty rate.

Rigid-hull inflatable boats are specifically addressed under 890319 (inflatable boats and rigid hull inflatables, NESOI) rather than the motorboat subheadings, provided they meet the inflatable-boat description. Classification should be confirmed against the heading text and any applicable CBP rulings, as the construction method — not just the presence of a motor — is determinative.