National Master 200 GL and Inland
Credential: National Master 200 GL and Inland
Credentialing Agency: United States Coast Guard (USCG)
Renewal Period: 5 years
The National Master 200 Great Lakes (GL) and Inland officers are responsible for vessels of less than 200 GRT and its safe and efficient operation including, the ship's seaworthiness, safety and security conditions, cargo operations, navigation, and crew management. National Master 200 GL and Inland officers set the course and speed, maneuver the vessel to avoid hazards and other ships, and periodically determine its position using navigation aids, celestial observations, and charts. They direct crew members who steer the vessel, operate engines, signal to other vessels, perform maintenance and handle lines, or operate towing or dredging gear. Masters ensure that proper procedures and safety practices are followed, ensure machinery and equipment are in reliable working order, and oversee the loading and unloading of cargo or passengers. They also maintain logs and other records of ships' movements and cargo carried. The Master is always in command of a merchant ship and regulates the proper daily transactions and handles the legal affairs on maritime issues. Candidates must meet a minimum sea service, training, and exam requirement.
More information can be found on the certifying agency's website.
National Master 200 GL and Inland
MINIMUM REQUIREMENTS
Attainability:
Eligibility Requirements (View Details)
- Credential Prerequisite
- Experience: 360 days
- Education
- Training
- Membership
- Other
- Fee
Note: This credential may have multiple options for a Service member to meet eligibility requirements. Requirements listed here are based on the minimum degree required. To view other options, see the Eligibility tab.
Exam Requirements (View Details)
- Exam
- Written Exam
- Oral Exam
- Practical Exam
- Performance Assessment
Exam Administration (View Details)
- In-person exam
- Remote proctored on-line exam
- Third-party test vendor
RECERTIFICATION SUMMARY
Renewal Period: 5 years
AGENCY CONTACT INFORMATION
United States Coast Guard (USCG)
United States Department of Homeland Security
2100 2nd St. S.W.
Washington, DC 20593-0001
Phone: (202) 267-0218
Email: iasknmc@uscg.mil
Sea Service Requirement REQUIREMENTS
Applicant must meet the following sea service requirement:
- Great Lakes - 360 total days of service, in any position or department, OF WHICH:
- 180 days must have been as a Master, Mate, or equivalent position while holding a license or endorsement as Master, Mate, Master or Mate(pilot) of towing vessels, or OUPV, AND
- 90 days of service on Great Lakes
- Inland – 360 total days of service, in any position or department, OF WHICH:
- 180 days must have been as a Master, Mate, or equivalent position while holding a license or endorsement as Master, Mate, Master or Mate(pilot) of towing vessels, or OUPV.
For additional information refer to the NMC Checklist.

Knowledge Test GLI05
- Q100 Rules of the Road: Inland and International
- Q300 Rules of the Road: Inland
- Q340 Deck General
- Q341 Deck Safety
- Q342 Navigation General: Great Lakes and Inland
- Q343 Navigation Problems: Chart Plot
Exam Preparation Resources
There are a number of resources available to help you prepare for the National Master 200 GL and Inland examination:
- Best Sources
- General References
An additional resource is O'Reilly Learning Safari Books Online, a searchable digital library that provides online access to thousands of books, training videos and conference sessions. See the Educational Resources section on the Related Sites page here on COOL to learn how to get free access.
Testing Information
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Exam Administration
Credential exams may be administered in-person at a testing site, proctored on-line remotely, or have options for both. If an exam is administered through a test vendor, the third-party test vendor box will be checked. The following test administration options apply to the National Master 200 GL and Inland credential where checked:
- In-person exam
- Remote proctored on-line exam
- Third-party test vendor
For more information on the United States Coast Guard (USCG) testing process, visit the agency website.
National Master 200 GL and Inland include:
Applicants for the Merchant Mariner Credential (MMC) must meet the listed general requirements:
- Meet the credential age requirement.
- Submit evidence of holding or having applied for Transportation Working Identification Card (TWIC) from TSA.
- Submit completed MMC Application CG-Form 719B.
- Must submit evidence of appropriate Sea Service as required. Military sea service may be counted towards the sea service required to become a mariner. This military sea service is only part of the MMC evaluation. Documentation is key and must be submitted with the MMC application package to a Regional Exam Center.
- Provide photocopies the front and the back of all relevant Training Course Certificate(s) and Certifications.
- Submit CG Form- 719C Disclosure Statement for Narcotics, DWI/DUI, and/or other convictions as applicable.
- Provide proof of passing the appropriate vision, hearing, medical, or physical exam, documented on CG Form-719K or CG-719K/E.
- Provide evidence of passing a DOT/USCG periodic drug test on CG From- 719P.
- Submit evaluation, exam and issuance Fees as applicable.
National Master 200 GL and Inland include:
The United States Coast Guard (USCG) National Maritime Center (NMC) awards credentials to fully qualified mariners to assure a safe, secure, economically viable and environmentally sound Marine Transportation System. There are generally two types of mariner credentials: National and International, and they are awarded in two primary operational departments, Deck and Engine. However, before any mariner credential is awarded, applicants must first attain a Transportation Worker Identification Credential (TWIC).
The International credentials are governed in compliance with Standards of Training, Certification, and Watchkeeping (STCW). These international standards (STCW) were first developed in 1978 when the international maritime community realized that human factors played a dominant role in the prevention of marine casualties. The last major revision to the international STCW Convention and Code were adopted in 2010 in Manila, Philippines and took effect on 1 Jan 2012.
General Application Requirements include drug test compliance, medical screening, First Aid and CPR certificates of training, and firefighting training. In addition to the general application requirements, the primary data elements that NMC evaluators need from military mariner applicants to assess their experience and suitability for National or STCW level credentials are Military Sea Service history and Vessel Information as described below:
MILITARY SEA SERVICE
Military sea service experience must be a reasonable equivalent to the service required of a merchant mariner who is seeking an identical license. Evaluations of military sea service require submission of a Transcript of Sea Service (TOSS) or a Sea Service Letter. Each service has a slightly different version of their Sea Service letter; this example shows U.S. Navy Sea Service Letter requirements. U.S. Army applicants can request a copy of their Sea Service history through the Sea Pay system.
NMC Regional Examination Centers may also require an official description of duties statement, letters of qualification, service record entries, or letters from former supervisors or commanding officers as well. Specific details about sea service requirements for the various different credentials can be found in 46 CFR Part 10 - Merchant Mariner Credential, and 46 CFR Part 12 - Requirements for Rating Endorsements. Additional details related to criteria for accepting military sea experience can be obtained from the Marine Safety Manual-Vol III, and Section 3 of the Military File Evaluation Manual.
VESSEL INFORMATION
Each Service also has corresponding vessel information.
U.S. Navy applicants can reference this U.S. Navy Vessel Information chart for details on Ship Type, Name, Hull number, Ship Class, GRI ITC Tonnage, GRT Tonnage, Horsepower, and Propulsion Type when completing their Sea Service Letter.
U.S. Army applicant’s Vessel information will be included in the Sea Pay letter they request for military sea service history.
National Master 200 GL and Inland include:
Requirements for renewal:
- The applicant must either—
- Present evidence of at least 1 year of sea service during the past 5 years;
- Pass a comprehensive, open-book exercise covering the general subject matter as appropriate to the credential;
- Complete an approved refresher training course;
- Provide evidence of employment as a qualified instructor or in a position closely related to the credential.
- A credential may be renewed at any time during its validity and for 1 year after expiration.
There are no professional requirements for renewal for the following endorsements:
- Ordinary seaman, Wiper, Steward's department, Steward's department (F.H.).
- Cadet, Student observer, Apprentice engineer, Apprentice mate.
- Person in charge of medical care, Medical first-aid provider.
- GMDSS at-sea maintainer, GMDSS operator.
Certain STCW endorsements must complete approved refresher or revalidation training.