MARITIME MARINE SERVICES HIN Decoder
Hull Identification Numbers beginning with MMU were assigned by the US Coast Guard to MARITIME MARINE SERVICES of SEATTLE, WA. The company is recorded as out of business since 2014 — 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
MMU
Location
SEATTLE, WA
In business
since 2010
Status
Out of business (2014)
MARITIME MARINE SERVICES hulls (2010–2014) 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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MARITIME MARINE SERVICES HIN FAQ
What does a MARITIME MARINE SERVICES HIN look like?
It starts with the three characters "MMU" — the Manufacturer Identification Code the US Coast Guard assigned to MARITIME MARINE SERVICES — followed by a 5-character hull serial and a 4-character date code, 12 characters total. MARITIME MARINE SERVICES hulls (2010–2014) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is MARITIME MARINE SERVICES still in business?
USCG records list MARITIME MARINE SERVICES as out of business since 2014. 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 MARITIME MARINE SERVICES HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. MARITIME MARINE SERVICES hulls (2010–2014) 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 WA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "MARITIME MARINE SERVICES HIN Decoder," carwhere.com/hin-decoder/mmu, last verified 2026-06-12.