Federal Vessel Numbering Requirements Under 33 CFR Part 173

Federal vessel numbering requirements apply to every boat with an engine that operates on U.S. waters. Under 33 CFR Part 173, the owner must obtain a certificate of number from the state where the vessel is principally used, display that number on the bow according to strict rules, keep the certificate on board, and notify the issuing authority within 15 days of certain changes. The Coast Guard sets the baseline; the states run most of the paperwork. Violations carry federal civil penalties of up to $1,000.1Office of the Law Revision Counsel. 46 USC 12309

Which Boats Must Be Numbered

The rule reaches every vessel equipped with propulsion machinery of any type, used on waters under U.S. jurisdiction or on the high seas if owned in the United States.2eCFR. 33 CFR 173.11 – Applicability “Propulsion machinery” covers everything from a 300-horsepower outboard to a small electric trolling motor. If it has an engine, it needs a number, and no one may operate it without a valid state-issued number properly displayed on the hull.3eCFR. 33 CFR 173.15 – Vessel Number Required

A vessel that holds a valid Coast Guard certificate of documentation under 46 CFR Part 67 is already identified through that system and does not need a state number. The numbering scheme targets undocumented vessels.

What Is Exempt

A short list of vessels is carved out of the requirement altogether:2eCFR. 33 CFR 173.11 – Applicability

  • Foreign vessels temporarily using U.S. waters.
  • United States government vessels, though recreational-type public vessels still need a number.
  • Vessels owned by a state or its subdivisions, used principally for governmental purposes and clearly identifiable as such.
  • Ships’ lifeboats carried aboard a larger vessel.
  • Vessels that hold or are required to hold a Coast Guard marine document.

Human-powered craft like kayaks and canoes fall outside the federal rule because they have no propulsion machinery, but some states register paddle craft independently. Check your state’s boating authority before assuming a kayak needs nothing.

How to Get a Certificate of Number

Apply to the issuing authority in the state where the boat is principally operated.4eCFR. 33 CFR 173.71 – Application for and Issuance of Certificate of Number In most states that means a state agency, often the department of natural resources or a motor vehicle office. In a handful of states the Coast Guard is the issuing authority.5Office of the Law Revision Counsel. 46 USC 12302 – Numbering of Undocumented Vessels

Federal regulations do not prescribe a national form. You apply “in the manner specified by the issuing authority” and pay whatever fee that authority charges. Application details and fees vary widely by state, as do registration periods, which typically run one to three years and may expire on your birth month, a fixed calendar date, or the anniversary of the original registration.

The certificate itself carries the state-issued number and expiration date, the state of principal use, the owner’s name and address, the vessel’s primary use (pleasure, rental, dealer demo, commercial passenger, commercial fishing, or other commercial), the Hull Identification Number if one exists, make and year, length, hull type and material, propulsion type, and fuel.6GovInfo. 33 CFR 173.25 The HIN is a 12-character code attached to the starboard side of the transom, within two inches of the top of the transom, gunwale, or hull-deck joint (whichever is lowest), with a duplicate hidden in an unexposed interior spot.7eCFR. 33 CFR 181.29 – Hull Identification Number Display Copy it onto the application exactly as it appears on the hull.

Displaying the Number on the Hull

Display rules exist so that law enforcement can read the number quickly, from a distance, in bad light. The regulation is specific:8eCFR. 33 CFR 173.27 – Numbers Display Size Color

  • Paint or permanently attach the number to each side of the forward half of the vessel.
  • Use plain, vertical block characters. No slanted, cursive, or decorative fonts.
  • At least three inches tall.
  • A color that contrasts sharply with the hull background.
  • Read left to right.
  • Separate the letter and number groupings with a hyphen or space equal in width to a letter other than “I” or a number other than “1.” For example, DC 5678 EF or DC-5678-EF.

No other number may appear on the forward half of the vessel. Old registration numbers from a previous state, decorative graphics, or any other alphanumeric markings on the bow area are prohibited because they create confusion.9eCFR. 33 CFR 173.19 – Other Numbers Prohibited

In states where the Coast Guard is the issuing authority, a validation sticker comes with the certificate and must sit within six inches of the number on the hull. Operating without the sticker is treated the same as operating without a number.10eCFR. 33 CFR 173.35 – Coast Guard Validation Sticker Most state-run systems use their own validation decal with similar placement rules.

Keeping the Certificate on Board

The certificate must be on the vessel whenever it is in operation. Federal regulations accept either a hard copy or a digital version.11eCFR. 33 CFR 173.21 – Certificate of Number Required A federal, state, or local officer can ask to see it, and you have to produce it on request.12eCFR. 33 CFR 173.23 If you keep the paper card aboard, a waterproof pouch is cheap insurance.

For rental boats under 26 feet rented for less than seven days for noncommercial use, the rental company can keep the certificate ashore. The renter then carries a signed copy of the lease or rental agreement showing the vessel number and rental period.11eCFR. 33 CFR 173.21 – Certificate of Number Required

Taking the Boat to Another State

A visiting state must honor a number issued by the home state.5Office of the Law Revision Counsel. 46 USC 12302 – Numbering of Undocumented Vessels The complication comes with permanent moves. When a vessel changes its state of principal operation, the new state is only required to recognize the old number for 60 days.13eCFR. 33 CFR 173.17 – Reciprocity After that, the existing certificate is no longer valid.14eCFR. 33 CFR 173.77 – Validity of Certificate of Number Apply for a new number as soon as the move is settled, not on day 59.

When the Certificate Becomes Invalid

Beyond the 60-day relocation rule, several events void a certificate immediately:14eCFR. 33 CFR 173.77 – Validity of Certificate of Number

  • The vessel obtains or becomes required to obtain a Coast Guard certificate of documentation.
  • The named owner transfers all ownership interest.
  • The vessel is destroyed or abandoned.
  • The application contained false or fraudulent statements.
  • The issuance fees were never paid.
  • The owner loses interest through legal process such as a court judgment or foreclosure.

Once a certificate is invalid, operating the vessel without getting a new one violates federal law.

Changes You Must Report Within 15 Days

Five events trigger a 15-day notice to the issuing authority:15eCFR. 33 CFR 173.29 – Notification to Issuing Authority

  • Your home address changes.
  • The vessel is stolen, or a previously stolen vessel is recovered.
  • The physical certificate is lost or destroyed.
  • You sell the vessel or transfer any part of your ownership interest.
  • You destroy or abandon the vessel.

The method depends on the issuing authority. Most states accept online notice; where the Coast Guard is the authority, a specific Coast Guard form applies. The transfer notice is the one most owners forget, because buyer and seller each assume the other took care of it. If the certificate is lost or destroyed, apply for a duplicate through the same process used for the original.4eCFR. 33 CFR 173.71 – Application for and Issuance of Certificate of Number

Accident and Casualty Reporting

Part 173 also imposes reporting duties when something goes wrong on the water, and the deadlines are short.16eCFR. 33 CFR Part 173 – Vessel Numbering and Casualty and Accident Reporting

If someone dies or disappears from a vessel as a result of an occurrence involving the vessel or its equipment, the operator must notify the nearest reporting authority immediately, by the quickest available means. That notice must give the date, time, and location of the event, the name of the person who died or disappeared, the vessel’s number and name, and the names and addresses of the owner and operator. If the operator cannot give notice, every other person on board shares that duty.

A written report is required when an occurrence results in death, an injury requiring treatment beyond first aid, property damage of $2,000 or more (or the complete loss of any vessel), or a disappearance under circumstances suggesting death or injury. The deadlines run as follows:

  • 48 hours if a person dies within 24 hours of the occurrence.
  • 48 hours if a person is injured beyond first aid or disappears.
  • 10 days for other reportable incidents where the shorter deadlines do not apply.

If the operator cannot file, the owner must.

Penalties

Violating any provision of the federal vessel numbering chapter carries a civil penalty of up to $1,000. If the violation involves operating the vessel, the boat itself can be held liable through an in rem action, meaning authorities can potentially seize it to satisfy the penalty.1Office of the Law Revision Counsel. 46 USC 12309 The common triggers are operating without a number, displaying it incorrectly, failing to carry the certificate on board, and missing the 15-day notice window. State penalties can stack on top of the federal ones depending on local law.