USCG Engineering: Sea Service, Manning and the Yacht

AI-drafted catalogue content pending SME review. Sea service crediting and manning requirements change, and enforcement practice on recreational vessels was not confirmed from primary sources; verify with the National Maritime Center and the cognizant OCMI before relying on this for a career decision.

Free

USCG-ENG-SEA-M1 · Counting the Time

3 lessons

USCG-ENG-SEA-M1-A How the Coast Guard turns days aboard into sea service. Practice in examiner →

USCG-ENG-SEA-L1.1

What a day is

Every rung of the engineering ladder is priced in time. Three years in the engineroom. Eighteen months as a QMED. Twelve months as an Officer in Charge of an Engineering Watch. Those numbers are worthless until you know what the Coast Guard means by a day, a month and a year — because it does not mean what the calendar means.

USCG-ENG-SEA-L1.2

Yacht time counts — the NMC says so

There is a folk belief in the industry that the Coast Guard does not take yacht time — that it wants tugs, tankers and ships, and that the years you spent in the engineroom of a private motor yacht are a hobby as far as the National Maritime Center is concerned. It is not true, and the NMC says so in plain English.

USCG-ENG-SEA-L1.3

The two traps that get service rejected

The National Maritime Center publishes the mistakes it sees most. Two of them land squarely on yacht engineers, and neither can be fixed retrospectively once the boat is sold, the captain has moved on, or the owner has stopped answering.

USCG-ENG-SEA-M2 · Recency, Modes and Deck Credit

3 lessons

USCG-ENG-SEA-M2-A The rules that quietly disqualify people. Practice in examiner →

USCG-ENG-SEA-L2.1

Recency — the rule that quietly disqualifies people

The Coast Guard does not only ask how much time you have. It asks **when** you had it. Sea service is not a bank balance that sits and earns interest while you are ashore. It goes stale.

USCG-ENG-SEA-L2.2

Propulsion mode — the one-third rule

Under 46 CFR 11.502, at least one-third of the minimum service for any engineer endorsement must be served on the specific propulsion mode sought, and this lesson explains both that arithmetic and the four distinct routes available for adding a new mode to an endorsement already held.

USCG-ENG-SEA-L2.3

Deck credit is different at every rung

The Coast Guard credits deck time toward engineer endorsements, but the allowance varies at every level: this lesson maps the five different ceilings, explains the tonnage condition and the dual-cap arithmetic, and warns that these figures are maximums, not guarantees.

USCG-ENG-SEA-M3 · When a Vessel Needs an Engineer

3 lessons

USCG-ENG-SEA-M3-A Manning — where the number actually comes from. Practice in examiner →

USCG-ENG-SEA-L3.1

The 200 GRT line

There are two pieces of primary text here and they say the same thing from different directions. Neither of them mentions yachts.

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Where the manning number comes from

"How many engineers does she need?" sounds like a question with a formula behind it. It is not. It is a question with an **authority** behind it, and the authority is different depending on what kind of vessel you are standing on.

USCG-ENG-SEA-L3.3

When STCW attaches

This lesson unpacks the two-trigger structure of 46 CFR 15.1103(a), explaining how the size-and-power test and the international-voyage test independently activate the STCW endorsement requirement, and where the domestic-voyage exemption ends.

USCG-ENG-SEA-M4 · The Yacht

3 lessons

USCG-ENG-SEA-M4-A GRT, GT, the 6-pack myth, and the honest position. Practice in examiner →

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GRT is not GT

There are two tonnage systems in play on a US-flagged yacht, and they produce two different numbers for the same hull.

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The 6-pack is a deck ticket

Ask around a US dock about licences and somebody will mention the 6-pack inside a minute. It is the best-known credential in American boating, and for an engineer it is a **dead end** — not because it is a bad ticket, but because it answers a different question.

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The honest position, and what to do about it

This lesson sets out the full USCG engineering endorsement ladder as it applies to yacht engineers, covering each rung from QMED to STCW III/2, the crossover route between limited and unlimited grades, and the three requirements most likely to block progression.

Aligned to the published USCG framework. Official source.

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