Merchant Mariner
DOT RegulatedAlso known as: Merchant Marine, Seaman, Ship Captain, Marine Engineer, Deckhand, USCG Licensed Mariner
Merchant mariners require United States Coast Guard (USCG) medical certification with specific vision, hearing, and physical fitness standards. They are subject to DOT drug and alcohol testing under USCG regulations (46 CFR Part 16).
Required Health Screenings & Tests
| Requirement | Frequency | Regulation |
|---|---|---|
| Mariner Physical Examination USCG-required physical evaluating vision, hearing, physical capability, and freedom from conditions that could impair maritime duties. | Varies | 46 CFR Part 10 |
| DOT Drug Test (Pre-Employment) Required under USCG drug testing regulations for crewmembers on commercial vessels. | One-Time | 46 CFR Part 16 |
| Random Drug & Alcohol Testing USCG-mandated random testing program. | Varies | 46 CFR Part 16 |
Required Certifications
Merchant Mariner Credential (MMC)
- Issued by
- United States Coast Guard
- Valid for
- 5 years
- Renewal
- Medical exam, sea service documentation, endorsement-specific requirements, and USCG application.
Compliance Timeline
Pre-Hire
— Before First Sailing- USCG mariner physical
- Pre-employment drug test
- MMC verification
- Transportation Worker Identification Credential (TWIC)
Onboarding
— First 30 Days- Random testing enrollment
- Safety training (STCW if applicable)
Ongoing
— Throughout Career- Random drug/alcohol testing
- Post-incident testing
Periodic Renewal
— Every 5 Years- MMC renewal with medical exam
- TWIC renewal every 5 years
Frequently Asked Questions
What does a mariner physical include?
The USCG physical includes vision testing (varies by license type), hearing evaluation, blood pressure, urinalysis, and assessment of physical fitness for maritime duties. Some endorsements require additional testing like color vision and depth perception.
What Employers Should Know
- All screenings must be conducted at certified, compliant facilities.
- Maintain documentation of all completed requirements for audit readiness.
- Track renewal dates proactively — expired certifications can result in non-compliance penalties.
- DOT-regulated roles have strict federal testing requirements — random testing programs must be maintained.
Why BlueHive for Merchant Mariner
BlueHive connects employers to 20,000+ certified clinics nationwide, simplifying compliance management for merchant mariner health requirements.
- Same-day scheduling for urgent screenings
- Automated renewal tracking and compliance alerts
- Transparent, competitive pricing — no hidden fees
Simplify Compliance for Your Workforce
BlueHive manages occupational health requirements across 10,000+ clinic locations.