What You Need to Know Before You Start
A captain's license is issued by the U.S. Coast Guard and allows you to operate a vessel for hire — that is, to carry paying passengers or charge for your services. The license comes in different levels depending on the size of the boat and how far from shore you operate. You cannot get one without meeting the Coast Guard's requirements for sea time, passing their written exam, and passing a physical exam.
The most common license is the 6-pack license (officially called an Operator of Uninspected Passenger Vessels license), which lets you carry up to six paying passengers on boats under 65 feet. Above that, you need a Master license, which requires more sea time and covers larger vessels. Both routes start the same way: you log your hours on the water, study the exam material, and sit for the Coast Guard test.
Key Takeaways
- You must have at least 730 days of sea time in the past five years to get a 6-pack license, or 1,460 days for a Master license, and the Coast Guard will verify this through your employer or logbook.
- The written exam covers navigation rules, boat handling, safety procedures, and weather — you study from the Coast Guard's official exam guide and take the test at a Coast Guard Regional Examination Center.
- You must pass a physical exam that includes vision and hearing tests, and you cannot have certain medical conditions or take medications that disqualify you.
- The entire process typically takes three to six months from the time you have your sea time logged, depending on how quickly you study and schedule your exams.
- You will need to submit your process in person at a Coast Guard office with original documents — no online submission — and bring your passport or state ID, Social Security card, and proof of sea time.
Sea Time Requirements: How the Coast Guard Counts Your Hours
The Coast Guard requires you to log a specific number of days working on a vessel before you can test for a license. For a 6-pack license, you need 730 days of sea time in the five years before you explore. That works out to roughly two years of full-time work on the water. A Master license requires 1,460 days — four years of full-time work.
Sea time means you were actually working on the vessel, not just riding as a passenger. The Coast Guard accepts sea time in any capacity: deckhand, mate, engineer, fishing crew, or any other working role. You do not have to be paid, so volunteer work counts. The time must be on a vessel that is at least 25 feet long and operating in U.S. waters or waters where the U.S. has jurisdiction.
You document your sea time in a logbook that you keep yourself, or your employer keeps for you. The Coast Guard will ask to see this logbook when you explore. If you worked for a charter company or fishing operation, they may have official records they can submit on your behalf. Either way, you need to be able to prove the dates, the vessel name, and what you were doing.
The Written Exam: What to Study and Where to Take It
The Coast Guard written exam covers four main areas: Rules of the Road (navigation rules and right-of-way), Seamanship (boat handling and vessel operations), Safety (emergency procedures and equipment), and General Knowledge (weather, charts, and regulations). The exam has between 75 and 100 questions depending on the license type, and you have five and a half hours to complete it.
You study from the Coast Guard's official exam guide, which you can read free from the Coast Guard website or buy in print. Many people also use third-party study guides and practice tests, which are not official but often help you understand the material faster. You take the actual exam at a Coast Guard Regional Examination Center — there is one in most major ports and coastal cities. You schedule your exam date by calling or visiting the center in person.
The passing score is 70 percent. If you fail, you can retake the exam, but you have to wait at least 24 hours between attempts. Most people pass on the first or second try if they study the official guide thoroughly. Budget four to eight weeks of study time, depending on your background with boats.
The Physical Exam: Vision, Hearing, and Medical Disqualifications
Before you can receive your license, you must pass a physical exam administered by a Coast Guard-approved physician or the Coast Guard itself. The exam checks your vision (you need to see 20/40 or better in each eye, corrected or uncorrected), your hearing (you must be able to hear a whispered voice at three feet), and your overall health.
Certain medical conditions disqualify you: untreated high blood pressure, heart disease, diabetes requiring insulin, epilepsy, and some mental health conditions. Some medications also disqualify you, particularly those that cause drowsiness or impair judgment. If you have a condition or take a medication that might be a problem, contact the Coast Guard Regional Examination Center before you schedule your physical — they can tell you whether you will be disqualified.
The physical exam costs between $100 and $300 depending on the provider. You pay out of pocket; the Coast Guard does not cover it. Once you pass, the results are valid for the life of your license.
How to Submit Your process at a Coast Guard Office
You cannot submit your captain's license process online. You must go in person to a Coast Guard Regional Examination Center or a Coast Guard office that handles licensing. Bring your original documents: a valid passport or state ID, your Social Security card, your logbook or sea time documentation, and proof of your passed written exam and physical exam.
The process itself is the CG-156 form (process for Merchant Mariner Credential). You can fill it out at home and bring it with you, or fill it out at the office. The staff will review your documents, make sure everything is complete, and take your photograph for the license card. If anything is missing or unclear, they will tell you what you need to bring back.
Processing takes two to four weeks after you submit. The Coast Guard will mail your license card to the address you provide. You can check the status of your process by calling the Regional Examination Center or visiting in person.
Different License Types and What Each One Covers
The 6-pack license (Operator of Uninspected Passenger Vessels) is the entry point. It covers vessels under 65 feet carrying up to six paying passengers. This is what most charter boat captains, fishing guides, and small tour operators hold. It requires 730 days of sea time.
The Master license covers vessels of any size and any number of passengers, but requires 1,460 days of sea time and more detailed knowledge of navigation and vessel management. If you want to run a larger charter boat or a commercial fishing vessel, you need a Master license.
There are also Mate licenses, which allow you to work as a first or second mate on larger vessels but not as captain. These require less sea time than a Master license and are sometimes a stepping stone to a captain's license.
All licenses must be renewed every five years. Renewal requires you to take a physical exam again and pay a renewal fee, but you do not have to retake the written exam unless the Coast Guard has updated the rules significantly.
Common Mistakes That Delay or Derail Your process
The most common mistake is not having your sea time documented properly. The Coast Guard will not accept vague estimates or word-of-mouth confirmation from your employer. You need dates, vessel names, and a signature from someone who can verify you were there. If you worked years ago and your employer is out of business, get a written statement from a supervisor or coworker who can confirm the dates.
Another frequent problem is submitting incomplete documents. Bring originals, not copies, of your ID and Social Security card. If you are missing even one required document, the office will not process your process that day. Call ahead and ask the Regional Examination Center for a complete checklist so you do not make a second trip.
Some people also underestimate how long it takes to study for the exam. The material is dense and specific — navigation rules, buoy systems, and emergency procedures are not intuitive. Budget at least a month of regular study, especially if you have not worked on boats in a while.
Frequently Asked Questions
Do I need a captain's license if I only operate my own boat and do not carry paying passengers?
No. A captain's license is only required if you operate a vessel for hire — meaning you charge money or accept payment in any form. If you own a boat and use it recreationally, you do not need a license. Some states require a boating safety certificate for recreational use, but that is different from a captain's license.
Can I count sea time from working on boats outside the United States?
The Coast Guard accepts sea time from U.S. waters and waters where the U.S. has jurisdiction. Sea time from international waters or foreign ports may count if you were on a U.S.-flagged vessel, but you should contact your Regional Examination Center to confirm. Time on foreign-flagged vessels generally does not count.
What happens if I fail the written exam?
You can retake it after waiting 24 hours. There is no limit to how many times you can retake the exam, and each attempt costs the same fee (usually $100 to $150). Most people who study the official guide pass within two attempts.
How much does a captain's license cost in total?
The written exam costs between $100 and $150, the physical exam costs between $100 and $300, and the license process fee is around $130. The total out-of-pocket cost is roughly $330 to $580, not counting study materials or travel to the Regional Examination Center.
Can I work as a captain while my process is being processed?
No. You cannot legally operate a vessel for hire until your license card arrives. Once you pass the written exam and physical exam, you can ask the Coast Guard for a temporary document that proves you have passed, but this is not the same as a license. Check with your Regional Examination Center about whether they issue temporary credentials.