HYDRO TECHNOLOGY INC HIN Decoder
Hull Identification Numbers beginning with HTQ were assigned by the US Coast Guard to HYDRO TECHNOLOGY INC of GROSSE ISLE, MI. The company is recorded as out of business since 2001 — 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
HTQ
Location
GROSSE ISLE, MI
In business
since 1983
Status
Out of business (2001)
HYDRO TECHNOLOGY INC built hulls across both HIN eras (1983–2001): 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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HYDRO TECHNOLOGY INC HIN FAQ
What does a HYDRO TECHNOLOGY INC HIN look like?
It starts with the three characters "HTQ" — the Manufacturer Identification Code the US Coast Guard assigned to HYDRO TECHNOLOGY INC — followed by a 5-character hull serial and a 4-character date code, 12 characters total. HYDRO TECHNOLOGY INC built hulls across both HIN eras (1983–2001): 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 HYDRO TECHNOLOGY INC still in business?
USCG records list HYDRO TECHNOLOGY INC as out of business since 2001. 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 HYDRO TECHNOLOGY INC HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. HYDRO TECHNOLOGY INC built hulls across both HIN eras (1983–2001): 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 MI
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "HYDRO TECHNOLOGY INC HIN Decoder," carwhere.com/hin-decoder/htq, last verified 2026-06-12.