Gross Tonnage Thresholds That Trigger Ship Certificates: 150, 300, 400, 500, and 5,000 GT

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Planned scope. Why the same ship crosses into different regimes at each threshold, and the tanker split at 150 GT.

Regulatory anchor. MARPOL Annex I reg. 7; SOLAS 1974 ch. I reg. 12; MARPOL Annex VI reg. 27

Cluster. Ship certificates and documents carried on board. Catalogued in research/ship-certificates-onboard.md.

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