33 C.F.R. § 169.205

What types of ships are required to transmit LRIT information (position reports)?

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The following ships, while engaged on an international voyage, are required to transmit position reports:

(a) A passenger ship, including high speed passenger craft.

(b) A cargo ship, including high speed craft, of 300 gross tonnage or more.

(c) A mobile offshore drilling unit while underway and not engaged in drilling operations.