GULFSTREAM MARINE INTERNATL HIN Decoder
Hull Identification Numbers beginning with CIY were assigned by the US Coast Guard to GULFSTREAM MARINE INTERNATL of FT LAUDERDALE, FL. The company is recorded as out of business since 1996 — 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
CIY
Location
FT LAUDERDALE, FL
In business
since 1983
Status
Out of business (1996)
GULFSTREAM MARINE INTERNATL built hulls across both HIN eras (1983–1996): 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.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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GULFSTREAM MARINE INTERNATL HIN FAQ
What does a GULFSTREAM MARINE INTERNATL HIN look like?
It starts with the three characters "CIY" — the Manufacturer Identification Code the US Coast Guard assigned to GULFSTREAM MARINE INTERNATL — followed by a 5-character hull serial and a 4-character date code, 12 characters total. GULFSTREAM MARINE INTERNATL built hulls across both HIN eras (1983–1996): 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 GULFSTREAM MARINE INTERNATL still in business?
USCG records list GULFSTREAM MARINE INTERNATL as out of business since 1996. 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 GULFSTREAM MARINE INTERNATL HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. GULFSTREAM MARINE INTERNATL built hulls across both HIN eras (1983–1996): 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.
Other builders in FL
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "GULFSTREAM MARINE INTERNATL HIN Decoder," carwhere.com/hin-decoder/ciy, last verified 2026-06-12.