GREAT LAKES BOAT BUILDING SCHOOL HIN Decoder — MIC GLS
Hull Identification Numbers beginning with GLS were assigned by the US Coast Guard to GREAT LAKES BOAT BUILDING SCHOOL of CEDARVILLE, MI. 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
GLS
Location
CEDARVILLE, MI
In business
since 2008
Status
Listed active in USCG records
GREAT LAKES BOAT BUILDING SCHOOL hulls (2008–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 GREAT LAKES BOAT BUILDING SCHOOL HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example GLS45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | GLS | Identifies GREAT LAKES BOAT BUILDING SCHOOL, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | GREAT LAKES BOAT BUILDING SCHOOL'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 GREAT LAKES BOAT BUILDING SCHOOL? 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
GREAT LAKES BOAT BUILDING SCHOOL HIN FAQ
What does a GREAT LAKES BOAT BUILDING SCHOOL HIN look like?
It starts with the three characters "GLS" — the Manufacturer Identification Code the US Coast Guard assigned to GREAT LAKES BOAT BUILDING SCHOOL — followed by a 5-character hull serial and a 4-character date code, 12 characters total. GREAT LAKES BOAT BUILDING SCHOOL hulls (2008–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is GREAT LAKES BOAT BUILDING SCHOOL still in business?
USCG records list GREAT LAKES BOAT BUILDING SCHOOL of CEDARVILLE, MI in the MIC database (registered 2008).
How do I decode the year on a GREAT LAKES BOAT BUILDING SCHOOL HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. GREAT LAKES BOAT BUILDING SCHOOL hulls (2008–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 GREAT LAKES BOAT BUILDING SCHOOL 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 "GLS" MIC the same as a GREAT LAKES BOAT BUILDING SCHOOL serial number?
No. "GLS" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies GREAT LAKES BOAT BUILDING SCHOOL. The hull serial number is characters 4–8: GREAT LAKES BOAT BUILDING SCHOOL'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 GREAT LAKES BOAT BUILDING SCHOOL 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 GREAT LAKES BOAT BUILDING SCHOOL records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in MI
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, "GREAT LAKES BOAT BUILDING SCHOOL HIN Decoder," carwhere.com/hin-decoder/gls, last verified 2026-06-15.