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Tonnage, Displacement & the Classification-Society Landscape

Inside this lesson
  • Explain that gross tonnage (GT) and net tonnage (NT) are volumetric measures, not weights
  • Distinguish tonnage from displacement, a true measure of a ship's mass
  • Describe the role of classification societies as technical standards-setting and survey organizations
  • Recognize that classification and statutory regulation are distinct frameworks

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Educational content covering topics typical of a first- and second-year marine engineering / naval architecture curriculum. Not a substitute for accredited coursework, and not suitable for real vessel design, operation, or safety decisions without review by a licensed professional engineer. References to classification societies, SOLAS, or MARPOL are descriptive context only, not compliance guidance.