GUAM HOMEMADE BOATS (OOB) HIN Decoder — MIC GMZ
Hull Identification Numbers beginning with GMZ were assigned by the US Coast Guard to GUAM HOMEMADE BOATS (OOB) of GUAM, GU. The company is recorded as out of business since 2011 — 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
GMZ
Location
GUAM, GU
In business
since 1973
Status
Out of business (2011)
GUAM HOMEMADE BOATS (OOB) built hulls across both HIN eras (1973–2011): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
How a GUAM HOMEMADE BOATS (OOB) HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example GMZ45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | GMZ | Identifies GUAM HOMEMADE BOATS (OOB), assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | GUAM HOMEMADE BOATS (OOB)'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 GUAM HOMEMADE BOATS (OOB)? Check it before you pay.
GUAM HOMEMADE BOATS (OOB) is recorded out of business (2011) — 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
GUAM HOMEMADE BOATS (OOB) HIN FAQ
What does a GUAM HOMEMADE BOATS (OOB) HIN look like?
It starts with the three characters "GMZ" — the Manufacturer Identification Code the US Coast Guard assigned to GUAM HOMEMADE BOATS (OOB) — followed by a 5-character hull serial and a 4-character date code, 12 characters total. GUAM HOMEMADE BOATS (OOB) built hulls across both HIN eras (1973–2011): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
Is GUAM HOMEMADE BOATS (OOB) still in business?
USCG records list GUAM HOMEMADE BOATS (OOB) as out of business since 2011. 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 GUAM HOMEMADE BOATS (OOB) HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. GUAM HOMEMADE BOATS (OOB) built hulls across both HIN eras (1973–2011): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Where is the HIN on a GUAM HOMEMADE BOATS (OOB) 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 "GMZ" MIC the same as a GUAM HOMEMADE BOATS (OOB) serial number?
No. "GMZ" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies GUAM HOMEMADE BOATS (OOB). The hull serial number is characters 4–8: GUAM HOMEMADE BOATS (OOB)'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 GUAM HOMEMADE BOATS (OOB) 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 GUAM HOMEMADE BOATS (OOB) records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in GU
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, "GUAM HOMEMADE BOATS (OOB) HIN Decoder," carwhere.com/hin-decoder/gmz, last verified 2026-06-15.