SEA MARK BOATS HIN Decoder
Hull Identification Numbers beginning with ADL were assigned by the US Coast Guard to SEA MARK BOATS of ROCKY POINT, NC. 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
ADL
Location
ROCKY POINT, NC
In business
since 1972
Status
Listed active in USCG records
SEA MARK BOATS built hulls across both HIN eras (1972–present): 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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SEA MARK BOATS HIN FAQ
What does a SEA MARK BOATS HIN look like?
It starts with the three characters "ADL" — the Manufacturer Identification Code the US Coast Guard assigned to SEA MARK BOATS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. SEA MARK BOATS built hulls across both HIN eras (1972–present): 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 SEA MARK BOATS still in business?
USCG records list SEA MARK BOATS of ROCKY POINT, NC in the MIC database (registered 1972).
How do I decode the year on a SEA MARK BOATS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. SEA MARK BOATS built hulls across both HIN eras (1972–present): 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 NC
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "SEA MARK BOATS HIN Decoder," carwhere.com/hin-decoder/adl, last verified 2026-06-12.