33 C.F.R. § 169.125

What classes of ships are required to make reports?

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Each self-propelled ship of 300 gross tons or greater must participate in the reporting systems, except government ships exempted from reporting by regulation V/8-1(c) of SOLAS. However, exempt ships are encouraged to participate in the reporting systems.

[USCG-1999-5525, 66 FR 58070, Nov. 20, 2001]