S. 4357 would reauthorize and amend programs administered by the Maritime Administration and amend the conditions under which a Merchant Mariner Credential could be revoked or suspended. The bill would authorize the appropriation of roughly $1.8 billion over the 2023-2027 period mostly for Maritime Administration activities. CBO estimates that enacting S. 4357 would have an insignificant effect on direct spending and no effect on revenues over the 2023-2032 period. Because S. 4357 would increase costs for activities not covered by the specified authorizations, CBO has not estimated the full discretionary costs of implementing the bill. The bill would impose private-sector mandates as defined in the Unfunded Mandates Reform Act that would not exceed the annual threshold of $184 million in 2022 (adjusted annually for inflation). The bill contains no intergovernmental mandates.