GREENWELL BOATWORKS HIN Decoder
Hull Identification Numbers beginning with GBT were assigned by the US Coast Guard to GREENWELL BOATWORKS of DAMERON, MD. 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
GBT
Location
DAMERON, MD
In business
since 2019
Status
Listed active in USCG records
GREENWELL BOATWORKS hulls (2019–present) 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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GREENWELL BOATWORKS HIN FAQ
What does a GREENWELL BOATWORKS HIN look like?
It starts with the three characters "GBT" — the Manufacturer Identification Code the US Coast Guard assigned to GREENWELL BOATWORKS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. GREENWELL BOATWORKS hulls (2019–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is GREENWELL BOATWORKS still in business?
USCG records list GREENWELL BOATWORKS of DAMERON, MD in the MIC database (registered 2019).
How do I decode the year on a GREENWELL BOATWORKS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. GREENWELL BOATWORKS hulls (2019–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.
Other builders in MD
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "GREENWELL BOATWORKS HIN Decoder," carwhere.com/hin-decoder/gbt, last verified 2026-06-12.