MARATHON BOAT GROUP INC HIN Decoder — MIC GMM
Hull Identification Numbers beginning with GMM were assigned by the US Coast Guard to MARATHON BOAT GROUP INC of MARATHON, NY. The builder is listed in the USCG MIC database. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
GMM
Location
MARATHON, NY
In business
since 1996
Status
Listed active in USCG records
MARATHON BOAT GROUP INC hulls (1996–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
How a MARATHON BOAT GROUP INC HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example GMM45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | GMM | Identifies MARATHON BOAT GROUP INC, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | MARATHON BOAT GROUP INC's own production number for the specific hull (the letters I, O, Q are never used). |
| 9 | Certification month | D | Month built — A=January … L=December (D = April). |
| 10 | Certification year | 4 | Last digit of the certification year. |
| 11–12 | Model year | 24 | The boat’s model year. |
Free · no account · the HIN is on the transom, upper starboard (right) corner
Buying this MARATHON BOAT GROUP INC? Check it before you pay.
Decoding the HIN confirms the year and serial, but not the safety record. The $9.99 Boat Report adds the full CPSC marine-recall check, a HIN consistency check, a verify-before-you-buy checklist, and the USCG builder record for this hull — one downloadable report, one-time, no subscription. See what's included
MARATHON BOAT GROUP INC HIN FAQ
What does a MARATHON BOAT GROUP INC HIN look like?
It starts with the three characters "GMM" — the Manufacturer Identification Code the US Coast Guard assigned to MARATHON BOAT GROUP INC — followed by a 5-character hull serial and a 4-character date code, 12 characters total. MARATHON BOAT GROUP INC hulls (1996–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is MARATHON BOAT GROUP INC still in business?
USCG records list MARATHON BOAT GROUP INC of MARATHON, NY in the MIC database (registered 1996).
How do I decode the year on a MARATHON BOAT GROUP INC HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. MARATHON BOAT GROUP INC hulls (1996–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Where is the HIN on a MARATHON BOAT GROUP INC boat?
On the outside upper-starboard (right) corner of the transom, within two inches of the top — required by 33 CFR 181.29. Since August 1984 an identical duplicate HIN is also molded into an unexposed interior location as an anti-theft measure. Both should match the title, registration, and insurance card exactly.
Is the "GMM" MIC the same as a MARATHON BOAT GROUP INC serial number?
No. "GMM" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies MARATHON BOAT GROUP INC. The hull serial number is characters 4–8: MARATHON BOAT GROUP INC's own production number for that specific boat (the letters I, O, and Q are never used). The full 12-character HIN combines the MIC, the serial, and the date code.
Can a MARATHON BOAT GROUP INC HIN tell me the exact model?
Not on its own. A HIN encodes the builder, hull serial, certification month/year, and model year — not the model name or length. Match the decoded year and serial against MARATHON BOAT GROUP INC records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in NY
Sources: verified against the USCG Manufacturer Identification Code database (refreshed monthly) · HIN format per 33 CFR Part 181, Subpart C. Reviewed by Sam Reynolds, Lead Researcher, CarWhere. Cite this page: CarWhere, "MARATHON BOAT GROUP INC HIN Decoder," carwhere.com/hin-decoder/gmm, last verified 2026-06-15.