46 C.F.R. § 4.04-5
Substance of reports
The owner, charterer, managing operator, or agent, notifying the Coast Guard under § 4.04-1 or § 4.04-3, must:
(a) Provide the name and identification number of the vessel, floating OCS facility, or MODU, the names of the individuals on board, and other information that may be requested by the Coast Guard (when providing the names of the individuals on board for a passenger vessel, the list of passengers need only meet the requirements of 46 U.S.C. 3502); and
(b) Submit written confirmation of that notice to the Coast Guard facility that the notice was given to within 24 hours.