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Due to hurricane response operations, the Coast Guard has decided to postpone the release of Homeport 2.0 for the immediate future.
Legacy Homeport will remain online and fully operational for stakeholder use.
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Merchant Mariner Sea Service Renewal Calculator

Merchant Mariner Sea Service Renewal Calculator

  • This calculator will help determine if you meet the sea service requirements for renewing your Master, Mate, Engineer, Pilot, OUPV and MMD credentials.
  • Individuals may attest to their own Sea Service on vessels of under 200 GRT. For service on vessels over 200 GRT please refer to 46CFR10.211 for details on acceptable documentation.
  • The Sea Service time entered must have been completed within the past 5 years in order to count toward the 360 day requirement. Actual credit for Sea Service will be based on the date of application.
  • Additional information and a complete list of requirements for renewal can be found at http://www.uscg.mil/STCW or by calling 1-888-IASKNMC or emailing iasknmc@uscg.mil
  • We are working to expand the functionality of this calculator to include all types of credentials and service categories. Please re-visit this site often.

Delete Ship Date Discharge Date Sea Service Type Sea Service
  What Sea Service Types Are Available?

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DISCLAIMER: This tool is not an official evaluation of a Mariner's Sea Service. Actual credit for Sea Service will be based on the date of application.

All information is subject to verification. Please ensure you submit appropriate proof of ownership if utilizing self verification or applicable documentary evidence depicting the amount and nature of the sea service signed by appropriate officials or licensed masters.

MMLD Privacy Information | To send feedback contact: iasknmc@uscg.mil