46 CFR 15.1107: Maintenance of merchant mariners' records by owner or operator.

For every credentialed mariner employed on a U.S.-documented seagoing vessel, the owner or operator must ensure that the following information is maintained and readily accessible to those in management positions, including the Master of the vessel, who are responsible for the safety of the vessel, compliance with laws and regulations, and for the prevention of marine pollution:

(a) Experience and training relevant to assigned shipboard duties (i.e., record of training completed, ship-specific familiarization and of relevant on-the-job experience acquired).

(b) Copies of the mariner's current credentials.