How to apply for your USCG captain's license through the National Maritime Center — every required document, application fees, submission options, processing timelines, and what causes delays.
The National Maritime Center (NMC) is the USCG agency in Martinsburg, West Virginia responsible for processing all Merchant Mariner Credential (MMC) applications — including captain's licenses for OUPV (6-Pack) and Master licenses.
Applications are submitted through the Mariner Licensing & Documentation (MLD) portal, an online system that lets you submit scanned documents, pay your fee, and track your application status. The MLD portal is the fastest and most reliable submission method.
The NMC does not administer exams. Exams are handled by Regional Exam Centers (RECs), which send your passing results to the NMC automatically. Your job after passing the exam is to get all your documents together and submit a complete application.
3–8 wks
Online processing time
185 days
Drug test validity window
12 months
Physical exam validity window
5 years
MMC credential validity
The NMC process follows a fixed sequence. Do not submit until you have every document — a single missing item triggers a deficiency letter and resets your timeline.
Pass the USCG exam at a Regional Exam Center (REC)
Schedule your exam at a Regional Exam Center. Bring a government-issued photo ID, your TWIC card, and any required chart plotting tools. After you pass, the REC sends your exam results directly to the NMC — you do not need to submit them yourself.
Gather all required documents
Collect every document before opening your application. The NMC will put your application on hold (deficiency letter) if anything is missing — which resets your processing timeline. See the full checklist below.
Submit your application
Submit online through the MLD portal (fastest), by mail to the NMC in Martinsburg, WV, or in person at select Regional Exam Centers. Pay your application fee by credit card.
Track your status online
Log into the MLD portal using your mariner reference number to track your application. Respond quickly if the NMC sends a deficiency letter — delays in responding extend your timeline.
Receive your credential by mail
Once approved, the NMC mails your Merchant Mariner Credential (MMC) to the address on file. The credential is valid for 5 years from date of issue.
Every item below is required. A missing or deficient document results in a deficiency letter from the NMC, which pauses processing until you respond.
The primary application form. Use the current version from the NMC website — outdated form versions are a common rejection reason.
Completed by a licensed physician. Must not be more than 12 months old at the time the NMC receives your application — not at the time you submit it.
Must not be more than 185 days old when received by the NMC. This is one of the most common delay causes — the window closes faster than applicants expect when mail transit is added.
Submit a copy of your physical TWIC card. A pending TWIC application is not accepted — the physical card must be in your hands.
Signed by the vessel owner or operator on company letterhead. Must include: vessel name, official number, gross tonnage, route, dates of service, position held, and total days or hours.
Current certification from an approved provider. Required for all OUPV and Master license applications.
Each sea service letter must be on company letterhead, signed by the vessel owner or operator, and include all of the following:
Letters missing any of these fields will result in a deficiency. It is faster to get correct letters upfront than to chase down a corrected letter after submission.
Fees are paid by credit card. The NMC does not begin processing until payment is received.
Original OUPV (6-Pack)
$95
Original Master 100 GRT
$140
Renewal
$95
Endorsement (add-on)
$45
Expedited processing: approximately $175 additional. Fees subject to change — verify current fee schedule at the NMC website before submitting.
Three ways to submit — online is the fastest and most reliable.
Submit scanned documents through the Mariner Licensing & Documentation portal at the NMC website. Pay by credit card during the session. Online submissions skip postal transit delays and give you real-time application tracking from day one. This is the method the NMC recommends and the fastest path to your credential.
Mail a complete physical packet to the NMC in Martinsburg, WV. Add 1–2 weeks for inbound transit and the same for outbound. Use USPS Priority Mail with tracking and keep copies of everything. Pay by check or money order made out to the U.S. Coast Guard.
Some RECs accept walk-in applications. Call your local REC to confirm before making the trip — not all RECs process applications and hours vary. The REC forwards your packet to the NMC; it does not reduce NMC processing time.
Timelines assume a complete application with no deficiencies. Deficiency letters add weeks.
3–8 weeks
Online submission (typical)
+1–2 weeks
Mail transit each direction
~$175
Expedited processing fee
Processing time is measured from when the NMC receives a complete application — not from when you submit it. If you receive a deficiency letter, the clock effectively pauses until you provide the missing item.
Expedited processing is available if you have a documented urgent need (imminent employment, documented financial hardship related to the credential). Call the NMC at 1-888-IASKNMC (1-888-427-5662) to request expedited handling.
What to expect after your application reaches the NMC.
Log into the MLD portal using your mariner reference number. The portal shows your current processing status and any actions required on your part.
If the NMC identifies a missing or incomplete document, they send a deficiency letter through the MLD portal. Respond as quickly as possible — delays in your response extend your timeline proportionally.
Once approved, the NMC mails your Merchant Mariner Credential to the address on file in the MLD portal. Verify your address is correct before and after submission.
Your MMC is valid for 5 years from issue date. Set a reminder to begin renewal at least 6 months before expiration to avoid a lapse in your credential.
Missing the vessel official number, gross tonnage, or the signature of the vessel owner or operator is the single most common deficiency. The NMC will reject or hold any sea service letter that omits required fields.
The 185-day clock starts from the date of the test, not the date you submit. Mail transit adds time. If your drug test is close to the limit, submit online and immediately — or schedule a fresh test.
The NMC periodically updates form versions. Submitting an outdated CG-719B or CG-719K causes an automatic deficiency. Always download forms directly from the NMC website immediately before applying.
Forgetting to include a copy of the TWIC card is surprisingly common. The TWIC card copy is a required document — not an optional one. A pending TWIC application does not substitute.
The NMC will not begin processing until the fee is paid. Online submissions require credit card payment during the MLD portal session. Mail applications require a check or money order.
Online submissions through the MLD portal typically take 3–8 weeks from the date the NMC receives a complete application. Mail submissions add 1–2 weeks for transit in each direction. Expedited processing is available for an additional fee of approximately $175 and can reduce the wait significantly. Processing times vary based on application volume and whether the NMC issues a deficiency letter requesting additional information — which resets your place in the queue.
You need: (1) CG-719B application form, (2) CG-719K physical examination form completed by a licensed physician — not more than 12 months old at time of submission, (3) CG-719P drug test form — not more than 185 days old at time of submission, (4) copy of your TWIC card, (5) sea service letters on company letterhead signed by the vessel owner or operator — including vessel name, official number, gross tonnage, route, dates of service, position held, and total days or hours, (6) First Aid/CPR certificate, (7) any course completion certificates, and (8) application fee payment by credit card.
You can check your application status online through the Mariner Licensing and Documentation (MLD) portal at the NMC website. Log in using your mariner reference number. The portal shows your current application status, any deficiency letters the NMC has issued, and whether your credential has been mailed. If the NMC requests additional information via a deficiency letter, you must respond promptly — failure to respond stalls processing.
How to document sea time, what counts toward your requirement, and how to get compliant sea service letters from vessel owners
CG-719K physical exam and CG-719P drug test — timing windows, approved providers, and the 185-day rule
How to apply for your TWIC card, what it costs, processing time, and disqualifying offenses — including the waiver process
The NMC process starts with passing the USCG exam. 1,628+ practice questions, spaced repetition, and full section-by-section progress tracking. Free to start — no credit card.
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