SUNSHIP MARINE HIN Decoder — MIC GMU
Hull Identification Numbers beginning with GMU were assigned by the US Coast Guard to SUNSHIP MARINE of GULFPORT, MS. The company is recorded as out of business since 1981 — common for older hulls, and useful to know when hunting parts or records. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
GMU
Location
GULFPORT, MS
In business
since 1981
Status
Out of business (1981)
SUNSHIP MARINE hulls (1981–1981) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
How a SUNSHIP MARINE HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example GMU45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | GMU | Identifies SUNSHIP MARINE, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | SUNSHIP MARINE'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 SUNSHIP MARINE? Check it before you pay.
SUNSHIP MARINE is recorded out of business (1981) — which affects recalls, parts support, and resale. 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
SUNSHIP MARINE HIN FAQ
What does a SUNSHIP MARINE HIN look like?
It starts with the three characters "GMU" — the Manufacturer Identification Code the US Coast Guard assigned to SUNSHIP MARINE — followed by a 5-character hull serial and a 4-character date code, 12 characters total. SUNSHIP MARINE hulls (1981–1981) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
Is SUNSHIP MARINE still in business?
USCG records list SUNSHIP MARINE as out of business since 1981. That's common for older hulls — the HIN still decodes normally, and the out-of-business date helps date the boat and guides parts-hunting toward salvage and owner groups rather than a dealer network.
How do I decode the year on a SUNSHIP MARINE HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. SUNSHIP MARINE hulls (1981–1981) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Where is the HIN on a SUNSHIP MARINE 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 "GMU" MIC the same as a SUNSHIP MARINE serial number?
No. "GMU" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies SUNSHIP MARINE. The hull serial number is characters 4–8: SUNSHIP MARINE'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 SUNSHIP MARINE 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 SUNSHIP MARINE records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in MS
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, "SUNSHIP MARINE HIN Decoder," carwhere.com/hin-decoder/gmu, last verified 2026-06-15.