33 CFR §138.160

1. (a)Each COFR Operator of a vessel with a COFR, other than an unmanned, non-self-propelled barge, who is not also an owner of the vessel must ensure that the original or a legible copy of the vessel's demise charter-party (or other written document on the owner's letterhead, signed by the vessel owner, which specifically identifies the COFR Operator named on the COFR) is maintained on board the vessel.
2. (b)The demise charter-party or other document required by paragraph (a) of this section must be presented, upon request, for examination and copying, to the Director or other United States Government official.