# § 31324. Retention and examination of mortgages of vessels covered by preferred mortgages
**(a)** On request, the owner, master, or individual in charge of a vessel covered by a preferred mortgage shall permit a person to examine the mortgage if the person has business with the vessel that may give rise to a maritime lien or the sale, conveyance, mortgage, or assignment of a mortgage of the vessel.
**(b)** A mortgagor of a preferred mortgage covering a self-propelled vessel shall use diligence in keeping a certified copy of the mortgage on the vessel.
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**Source Credit**: (Pub. L. 100–710, title I, § 102(c), Nov. 23, 1988, 102 Stat. 4744.)
| Revised section | Source section (U.S. Code) |
| --- | --- |
| 31324 | 46:923 |
Section 31324(a) provides for examination of mortgages of a vessel that is covered by a preferred mortgage by persons that have business with the vessel that may give rise to a maritime lien or the sale, conveyance, mortgage, or assignment of the mortgage. This subsection makes no substantive change to law.
Section 31324(b) requires that a certified copy of the mortgage must be on board a self-propelled vessel. This subsection makes no substantive change to law.
## Statutory Notes and Related Subsidiaries
### Effective Date
Section effective , with certain exceptions and qualifications, see , set out as a note under .