GREENBANK BOATWORKS HIN Decoder
Hull Identification Numbers beginning with GDF were assigned by the US Coast Guard to GREENBANK BOATWORKS of DETROIT, MI. The company is recorded as out of business since 2005 — 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
GDF
Location
DETROIT, MI
In business
since 1997
Status
Out of business (2005)
GREENBANK BOATWORKS hulls (1997–2005) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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GREENBANK BOATWORKS HIN FAQ
What does a GREENBANK BOATWORKS HIN look like?
It starts with the three characters "GDF" — the Manufacturer Identification Code the US Coast Guard assigned to GREENBANK BOATWORKS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. GREENBANK BOATWORKS hulls (1997–2005) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is GREENBANK BOATWORKS still in business?
USCG records list GREENBANK BOATWORKS as out of business since 2005. 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 GREENBANK BOATWORKS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. GREENBANK BOATWORKS hulls (1997–2005) 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.
Other builders in MI
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "GREENBANK BOATWORKS HIN Decoder," carwhere.com/hin-decoder/gdf, last verified 2026-06-12.