OUPV Sea Time Requirements Explained
Builds guide sites for a livingPublished July 8, 2026Last updated July 27, 202616 min read
- The requirement is expressed in months, not days, and a day is defined as eight hours.
- Inland service other than the Great Lakes counts toward near-coastal only up to half the total required.
- The three-month ocean or near-coastal component sits inside the twelve months, not on top of it.
- Owners of vessels under 200 GRT may attest to their own service with proof of ownership.
- Limited and restricted versions of the endorsement exist at three months for specific work and named waters.
The regulation does not talk in days. It asks for twelve months of experience operating vessels, defines a day as eight hours, and then caps how much of your inland time may count at all. Those three rules interact, and the cap is the one that quietly costs people a season. The licensing hub gathers the rest of what goes into this credential.
What each version of the endorsement asks for
| Endorsement | Total | Of which |
|---|---|---|
| Near-coastal | 12 months operating vessels | 3 months ocean or near-coastal |
| Great Lakes and inland | 12 months on those waters | 3 months on Great Lakes |
| Inland | 12 months operating vessels | No sub-requirement stated |
| Limited, for camps and marinas | 3 months on that vessel type | Plus an approved boating course |
How much service is actually required?
Twelve months, expressed as months.
For the near-coastal version, an applicant must have a minimum of twelve months of experience in the operation of vessels, including at least three months of service on ocean or near-coastal waters.
For the Great Lakes and inland version, it is twelve months of service on those waters, including at least three months operating vessels on Great Lakes waters.
For the inland version, it is a minimum of twelve months of experience in the operation of vessels, with no separate sub-requirement attached.
The commonly quoted day count is a conversion people apply afterwards rather than a figure the regulation uses.
The requirements are at the section governing this endorsement.
Reading the sub-requirement carefully matters, because it is a component of the twelve rather than an addition to it.
What is a day, exactly?
Eight hours, with a floor of four.
The regulation defines a day, for the purpose of calculating service, as eight hours of watchstanding or day-working, not including overtime.
On vessels of less than a hundred gross tons a day is still considered eight hours, unless the Coast Guard determines the vessel's operating schedule makes that criterion inappropriate.
Where it does make that determination, the period will in no case be less than four hours.
So a guide running two half-day trips has an ordinary eight-hour day, and one running a single half-day may or may not, depending on how the schedule is assessed.
There is also a two-watch provision under which a twelve-hour working day may be creditable as one and a half days.
The definitions sit at the sea service section.
Does inland time count in full?
Not toward near-coastal, and this is the trap.
Service on inland waters other than the Great Lakes, where those waters are navigable waters of the United States, is credited on a day-for-day basis for up to fifty percent of the total required service.
Service on the Great Lakes, by contrast, is credited day-for-day up to a hundred percent of the total required service.
Service on vessels to which the international convention applies is credited day-for-day whether inland or coastwise.
The waters of the Inside Passage between Puget Sound and Cape Spencer in Alaska are specifically credited for a near-coastal endorsement.
Those rules apply to service toward an oceans, near-coastal or convention endorsement, so a candidate whose logbook is entirely on a river needs to read them before counting anything.
The inland waters piece covers whether you need the coastal version at all.
The lake guide who is further away than they think. Take somebody with eleven months on a large inland lake that is not one of the Great Lakes, plus one month crewing on a coastal charter, applying for the near-coastal endorsement. The requirement is twelve months total, of which at least three must be ocean or near-coastal. Now apply the credit rules. The inland time is capped at fifty percent of the total required service, so of the eleven months only six can count. The coastal month counts in full. That gives seven months of creditable service against twelve, and one month against the three-month coastal component. The honest position is five months short on the total and two months short on the sub-requirement, from a logbook that looked like a comfortable overshoot. Change one variable and the picture inverts: if that lake had been Lake Michigan, the eleven months would credit at up to a hundred percent, and the same person would be short only on the coastal component. Same days, same boats, same work, and the answer turns on which body of water it happened on. Anybody counting toward this credential should sort their days by water type before totalling them. This is arithmetic on the published credit rules and does not predict how any individual record will be evaluated.
What does the endorsement then let you do?
More than the name of the route suggests.
The near-coastal version limits the holder to service on domestic near-coastal waters not more than a hundred miles offshore, the Great Lakes, and all inland waters.
So one endorsement covers three categories of water rather than only the coast.
Endorsements issued for inland waters include all inland waters except the Great Lakes, which is the distinction people most often get backwards.
The endorsement itself applies to vessels of less than a hundred gross tons, with propulsion machinery of any type, carrying six or fewer passengers.
That description is worth reading in full, because each phrase in it is a limit.
The vessel category piece covers what uninspected means here.
Is there a shorter route?
Two, and almost nobody knows about them.
A limited version may be issued to an applicant to be employed by organisations such as formal camps, yacht clubs, educational institutions and marinas.
It requires three months of service in the operation of the type of vessel concerned, a satisfactory pass in an approved safe boating course, and a limited examination appropriate to the activity and route.
The approved courses named are those approved by the national association of state boating law administrators, or public education courses run by the power squadron or the national red cross, or a Coast Guard approved course.
The endorsement is then limited to the specific activity and the locality of the camp, club or marina.
Where the geography makes medical help slow to reach, first aid and resuscitation certificates are required as well.
Anybody whose work genuinely is a camp or a marina should look at this before assuming a full year is required.
What is the restricted version?
A named-waters endorsement, issued locally.
A restricted endorsement may be issued to applicants to be employed on inland navigable waters, limited to specific bodies of water approved by the local officer in charge of marine inspection.
Under it, that officer may modify the service and examination requirements.
The service floor becomes at least three months in the operation of the type of vessel and on each body of water for which the endorsement is requested.
The examination becomes one appropriate for the activity to be conducted and the waters authorised.
For a guide who works two rivers and intends to work nothing else, that is a materially different proposition from the general route.
It is also a local decision, so the answer depends on the office rather than on the regulation alone.
The examination piece covers how a restricted paper is assembled.
How is service proved?
On paper, with seven fields.
Service may be documented by certificates of discharge, pilotage service and billing forms, or service letters and other official documents from marine companies signed by the owner, operator, master or chief engineer of the vessel.
Unless it is a conforming certificate of discharge, the evidence must contain the vessel names and official numbers, the gross tonnage, the propulsion power and mode of propulsion, the amount and nature of the experience, the dates of service for each vessel with ports or terminals where applicable, and the routes on which the experience was acquired.
The Coast Guard must be satisfied as to the authenticity and acceptability of all evidence provided.
People rarely fail on total days; they fail because a boat's official number or tonnage was never written down.
Record those fields at the time rather than reconstructing them from memory two years later.
The apprenticeship piece covers the arrangement most of this service is worked under.
Can you sign off your own time?
Yes, if you own the boat.
For service on vessels of less than 200 gross tons, owners of vessels may attest to their own service and provide proof of ownership.
Those who do not own a vessel must obtain letters or other evidence from credentialed personnel or from the owners of the vessels listed.
That single provision is why a great many people buy a modest boat early rather than late.
It also means the proof-of-ownership document belongs in the same folder as the service record.
Nobody should read it as permission to be casual, since the authenticity requirement applies to a self-attestation exactly as it does to a letter.
The starting from nothing piece covers the order this usually happens in.
Does military service count?
Yes, and there is a conversion.
Sea service as a member of the armed forces is accepted as required experience for an original endorsement, a raise of grade, a renewal or an increase in scope.
Normally sixty percent of the total time onboard is considered equivalent underway service, though the periods of operation of each vessel may be evaluated separately.
An official transcript of sea service or history of assignments must be submitted, and the regulation states specifically that a discharge certificate alone is not acceptable evidence.
Deck ratings such as seaman, boatswain's mate, quartermaster and operations specialist are treated as deck service.
Time on vessels that get underway infrequently, such as tenders and repair vessels, normally attracts a twenty-five percent factor.
Submarine service is creditable for deck endorsements where at least a quarter of the total service submitted was on surface vessels.
What about time on a boat that never leaves?
Creditable, at a third, up to a limit.
Service on inspected vessels that are in operation but do not get underway is credited under its own rule.
For an original endorsement or a raise of grade, deck department service of that kind is creditable on a three-for-one basis, so twelve months of experience equals four months of creditable service.
That credit is capped at six months of service.
Engineering service on the same vessels is creditable day-for-day for up to half the service credit, for each day the engineering plant is operational.
It is a narrow provision, but for somebody who worked a dock-based operation it converts otherwise wasted time into a real contribution.
Does foreign service count?
Yes, subject to an equivalence assessment.
Experience acquired on foreign vessels is creditable for an original endorsement, subject to evaluation to determine that it is a fair and reasonable equivalent to service on United States merchant vessels.
The comparison is made with respect to grade, tonnage, horsepower, waters and operating conditions.
That experience is also creditable to meet the recency requirement, which is a separate hurdle from the total.
Documentary evidence must be submitted in the same form as domestic evidence, with any necessary official translation into English.
Anybody who has run boats abroad should submit that time rather than assuming it is worthless.
The two-state piece covers a smaller version of the same portability question.
How is course completion recorded?
Electronically, from late 2026.
A federal rule published in November 2024 requires course providers to submit mariner course completion data electronically.
That rule took effect in January 2025, with the reporting requirement itself not needing to be complied with until 25 November 2026.
It is published at the Federal Register.
The practical effect for a candidate is that a course completion reaches the Coast Guard from the provider rather than only in the applicant's own bundle.
Keep the paper certificate regardless, because a transition period is exactly when a record goes missing.
Confirm the current reporting position with your provider before you rely on it, since the compliance date is recent.
Is there a form for small boats?
Yes, and using it removes most of the argument.
The national maritime centre publishes a dedicated small vessel sea service form alongside the main application, the conviction statement, the drug test form and the medical certificate applications.
Filling that form rather than writing a letter forces every field the regulation requires to be present, which is exactly where free-text letters fail.
The centre asks that its forms be saved and completed in a proper document application rather than in a web browser, and named with the applicant's surname, forename and mariner reference number.
That naming convention exists because a misfiled document is the commonest administrative delay in the whole process.
The forms are published at the national maritime centre.
Print and keep a copy of every form submitted, since the centre's copy and yours are not the same record.
The renewal piece covers where these same forms reappear.
Does the service have to be recent?
Some of it, and that is a separate test.
The recency requirement sits alongside the total rather than inside it, asking for a period of qualifying service within a defined window before the application.
Old service therefore counts toward the total and does nothing for recency, which catches people returning to the water after a break.
Foreign service is expressly stated to be creditable toward recency as well as toward the total, which is useful for anybody who worked abroad recently.
The practical consequence is that a candidate who stopped boating three years ago cannot simply apply on an old logbook.
A short season of documented crewing solves it, and it is far cheaper than the alternative of waiting.
Plan the application around the recency window rather than around the day the total is reached.
What if the operator will not sign?
It happens, and there are routes around it.
An operator who has fallen out with you, closed the business or died is a real and common problem with a paper trail built on signatures.
The regulation accepts several forms of evidence rather than one, including official documents from marine companies and other records that establish the service.
Where you owned the vessel yourself, the self-attestation provision for boats under 200 gross tons removes the dependency entirely.
Where you did not, contemporaneous records such as pay documentation, trip logs and correspondence are worth keeping precisely for this situation.
The safest habit is to get service signed off annually rather than once at the end, while everybody involved still remembers and still exists.
The upgrade piece covers the credential this record eventually feeds into.
Where do people go wrong?
Five places, and the credit cap is first.
Counting inland days at face value toward a near-coastal endorsement, when they are capped at half the total required service.
Assuming the three-month component is additional to the twelve rather than part of it.
Logging trips without the vessel's official number, tonnage or propulsion, which is what actually makes a record acceptable.
Treating a four-hour trip as a day by default, when eight hours is the stated figure and four is a floor applied on a determination.
And overlooking the limited and restricted routes entirely, when one of them fits the work being done.
Every one of those is found by reading the regulation once rather than by asking around a dock.
The timeline piece covers how long the whole thing takes in practice.
What surprises people most?
That where you boated matters more than how much.
Inland time other than the Great Lakes counts for at most half of a near-coastal requirement, while Great Lakes time counts in full.
The second surprise is that owners of vessels under 200 gross tons may attest to their own service.
The third is that a limited version of the endorsement exists at three months for camps, clubs, educational institutions and marinas.
The fourth is that a local marine inspection officer may modify service and examination requirements for named bodies of water.
The fifth is that a Spanish-speaking applicant may be issued an endorsement restricted to waters in the vicinity of Puerto Rico.
The sixth is that a discharge certificate on its own is expressly not acceptable evidence of military sea service.
Read together, the section is far more flexible than its reputation and far more exacting about paperwork.
Building the record, in order
Log it, sort it, then count it.
Record every day at the time with vessel name, official number, tonnage, propulsion, dates, route and capacity.
Sort those days by water type before totalling anything, because the credit rules turn on it.
Aim deliberately at the three-month component rather than assuming volume will cover it.
Get letters signed while the operator still remembers you, not years afterwards.
Check whether the limited or restricted route fits the work you actually do.
Keep proof of ownership with the record if you are attesting to your own time.
And submit foreign and military service rather than discarding it, since both have published conversions.
Nothing here evaluates any individual service record, which is a determination the Coast Guard makes on evidence this page cannot see. The credit percentages, conversions and floors quoted are reproduced from the regulation as published on the date read, and several of them are expressed as maximums or as normal practice rather than as promises about how a particular record will be assessed. The worked example applies published credit rules to invented figures to show how they interact; it is not a forecast and no individual should treat their own arithmetic as a decision. No total day count is asserted anywhere on this page, because the regulation expresses the requirement in months and the conversion depends on the definition of a day and on how a vessel's operating schedule is assessed. The limited and restricted endorsements described involve determinations by a local marine inspection office, and whether either is available for particular work is a matter for that office. Course reporting arrangements are in transition and the compliance date quoted is recent. Confirm your own position with the national maritime centre before relying on any of it.
How this was checked. The service requirements are quoted from 46 CFR 11.467, requirements for a national endorsement as Operator of Uninspected Passenger Vessels of less than 100 GRT, as published in the Legal Information Institute's edition of the Code of Federal Regulations and read on 27 July 2026. Taken from it: that the section applies to an applicant for that endorsement, equipped with propulsion machinery of any type, carrying six or fewer passengers; that an endorsement for near-coastal waters limits the holder to service on domestic, near-coastal waters not more than 100 miles offshore, the Great Lakes, and all inland waters, and that endorsements issued for inland waters include all inland waters except the Great Lakes; that for a near-coastal endorsement an applicant must have a minimum of 12 months of experience in the operation of vessels, including at least 3 months of service on ocean or near-coastal waters; that for a Great Lakes and inland endorsement an applicant must have 12 months of service on Great Lakes or inland waters, including at least 3 months of service operating vessels on Great Lakes waters; that for an inland endorsement an applicant must have a minimum of 12 months of experience in the operation of vessels; that a limited endorsement may be issued to an applicant to be employed by organizations such as formal camps, yacht clubs, educational institutions, and marinas, limited to the specific activity and the locality, requiring 3 months of service in the operation of the type of vessel for which the endorsement is requested, satisfactory completion of a safe-boating course approved by the National Association of State Boating Law Administrators or those public education courses conducted by the U.S. Power Squadron or the American National Red Cross or a Coast Guard-approved course, a limited examination appropriate for the activity to be conducted and the route authorized, and the first aid and cardiopulmonary resuscitation course certificates where in the opinion of the Coast Guard the geographic area precludes obtaining medical services within a reasonable time; that restricted endorsements may be issued to applicants to be employed on inland navigable waters, limited to specific bodies of water approved by the cognizant officer in charge of marine inspection, who may modify the service and examination requirements to at least 3 months of service in the operation of the type of vessel and on each body of water for which the endorsement is requested and an examination appropriate for the activity to be conducted and the waters authorized; and that an applicant who speaks Spanish, but not English, may be issued an officer endorsement restricted to the navigable waters of the United States in the vicinity of Puerto Rico. The service credit and documentation rules are quoted from 46 CFR 10.232, sea service, read the same day. Taken from it: that sea service may be documented in various forms such as certificates of discharge, pilotage service and billing forms, and service letters or other official documents from marine companies signed by the owner, operator, Master, or Chief Engineer of the vessel, and that the Coast Guard must be satisfied as to the authenticity and acceptability of all evidence of experience or training provided; that documentary evidence, unless in the form of a conforming Certificate of Discharge, must contain the vessel names and official numbers listed on the registration, certificate, or document issued, the gross tonnage of the vessel, the propulsion power and mode of propulsion, the amount and nature of the applicant's experience, the applicable dates of service for each vessel and the ports or terminals if applicable, and the routes upon which the experience was acquired; that for service on vessels of less than 200 GRT, owners of vessels may attest to their own service and provide proof of ownership, and that those who do not own a vessel must obtain letters or other evidence from credentialed personnel or the owners of the vessels listed; that service toward an oceans, near-coastal or STCW endorsement is credited with Great Lakes service on a day-for-day basis up to 100 percent of the total required service, inland waters other than Great Lakes that are navigable waters of the United States on a day-for-day basis for up to 50 percent of the total required service, and service on vessels to which STCW applies on a day-for-day basis whether inland or coastwise, with the waters of the Inside Passage between Puget Sound and Cape Spencer, Alaska credited for a near-coastal and STCW endorsement; that sea service as a member of the Armed Forces will be accepted as required experience for an original, raise of grade, renewal, or increase in scope of all endorsements, that normally 60 percent of the total time onboard is considered equivalent underway service though the periods of operation of each vessel may be evaluated separately, that an official transcript of sea service or history of assignments must be submitted and a DD-214 is not acceptable evidence of sea service, that service in deck ratings such as seaman apprentice, seaman, boatswain's mate, quartermaster, or Radarman/Operations Specialist are considered deck service, that a 25-percent factor is normally applied to assignment to vessels that get underway infrequently such as tenders and repair vessels, and that submarine service is creditable as if it were surface vessel service where at least 25 percent of all service submitted was obtained on surface vessels; that for service on vessels that do not get underway, deck department service is creditable on a 3-for-1 basis for original issue and raise of grade, with 12 months of experience equalling 4 months of creditable service, for up to 6 months of service credit, and engineering department service may be credited day-for-day for up to 50 percent of the service credit for each day the engineering plant is operational; that experience and service acquired on foreign vessels is creditable for establishing eligibility for an original or renewal endorsement subject to evaluation by the Coast Guard to determine that it is a fair and reasonable equivalent to service acquired on merchant vessels of the United States with respect to grade, tonnage, horsepower, waters, and operating conditions, is also creditable to meet recency requirements, and must be evidenced with any necessary official translation to the English language; and that for the purpose of calculating service a day is equal to 8 hours of watchstanding or day-working not to include overtime, that on vessels authorized to operate a two-watch system a 12-hour working day may be creditable as one and a half days of service, and that on vessels of less than 100 GRT a day is considered as 8 hours unless the Coast Guard determines that the vessel's operating schedule makes this criterion inappropriate, in which case in no case will this period be less than 4 hours. The course reporting material is taken from the final rule Electronic Submission of Mariner Course Completion Data, published in the Federal Register on 25 November 2024 and read on 27 July 2026, which states that the final rule is effective January 17, 2025 and that reporting requirements in 46 CFR 10.403(a)(7) need not be complied with until November 25, 2026. The arithmetic in the calculation panel applies the published credit percentages to invented figures and is arithmetic rather than a quotation. No total day count is asserted anywhere on this page and none was verified.
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How much service is actually required?
Twelve months, expressed as months. For the near-coastal version, an applicant must have a minimum of twelve months of experience in the operation of vessels, including at least three months of service on ocean or near-coastal waters. For the Great Lakes and inland version it is twelve months of service on those waters, including at least three months operating vessels on Great Lakes waters. For the inland version it is a minimum of twelve months of experience, with no separate sub-requirement. The commonly quoted day count is a conversion people apply afterwards rather than a figure the regulation uses.
What is a day, exactly?
Eight hours, with a floor of four. The regulation defines a day, for the purpose of calculating service, as eight hours of watchstanding or day-working, not including overtime. On vessels of less than a hundred gross tons a day is still considered eight hours, unless the Coast Guard determines the vessel's operating schedule makes that criterion inappropriate, and where it does the period will in no case be less than four hours. There is also a two-watch provision under which a twelve-hour working day may be creditable as one and a half days.
Does inland time count in full?
Not toward near-coastal, and this is the trap. Service on inland waters other than the Great Lakes, where those waters are navigable waters of the United States, is credited day-for-day for up to fifty percent of the total required service. Service on the Great Lakes is credited day-for-day up to a hundred percent. Service on vessels to which the international convention applies is credited day-for-day whether inland or coastwise, and the waters of the Inside Passage between Puget Sound and Cape Spencer in Alaska are specifically credited for a near-coastal endorsement.
Is there a shorter route?
Two, and almost nobody knows about them. A limited version may be issued to an applicant to be employed by organisations such as formal camps, yacht clubs, educational institutions and marinas, requiring three months of service in the operation of the type of vessel concerned, a pass in an approved safe boating course, and a limited examination appropriate to the activity and route. The endorsement is then limited to the specific activity and locality. Where geography makes medical help slow to reach, first aid and resuscitation certificates are required as well.
What is the restricted version?
A named-waters endorsement, issued locally. A restricted endorsement may be issued to applicants to be employed on inland navigable waters, limited to specific bodies of water approved by the local officer in charge of marine inspection. That officer may modify the service and examination requirements, with the service floor becoming at least three months in the operation of the type of vessel and on each body of water for which the endorsement is requested, and the examination becoming one appropriate for the activity and the waters authorised.
How is service proved?
On paper, with seven fields. Service may be documented by certificates of discharge, pilotage service and billing forms, or service letters and other official documents from marine companies signed by the owner, operator, master or chief engineer. Unless it is a conforming certificate of discharge, the evidence must contain the vessel names and official numbers, the gross tonnage, the propulsion power and mode, the amount and nature of the experience, the dates of service for each vessel with ports or terminals where applicable, and the routes on which the experience was acquired.
Can you sign off your own time?
Yes, if you own the boat. For service on vessels of less than 200 gross tons, owners of vessels may attest to their own service and provide proof of ownership. Those who do not own a vessel must obtain letters or other evidence from credentialed personnel or from the owners of the vessels listed. That single provision is why a great many people buy a modest boat early rather than late. Nobody should read it as permission to be casual, since the authenticity requirement applies to a self-attestation exactly as it does to a letter.
Sources & methods
- 46 CFR 11.467, the twelve-month requirement and the limited and restricted endorsements (Legal Information Institute)
- Electronic Submission of Mariner Course Completion Data, final rule and compliance date (Federal Register)
- Examinations, forms and the small vessel sea service form (National Maritime Center)
Every figure here is traced to a named public source and checked against it. Licensing, tax, and fee rules change. Verify your state’s current rules with the agency directly before you count on any number here.
Evan Knox
I build booking websites and run the ads and search for owner-run fishing guides, one operation per stretch of water. My first guide client, Bowman Fly Fishing, grew its revenue 4x in a year from that work. Field Notes is where I put the straight numbers on the business of guiding.
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The sea time gets you the license. It doesn't get you a single booking.
I'm Evan, and once the 360 days are logged and the license is in hand, the job that never stops is making sure clients can actually find and book your charters. I build booking websites and run the search and ads for owner-run guide operations, one operation per stretch of water. Text me at (470) 777-9686 and I'll build you a free preview of a site before you pay a thing.