HALCYON MARINE PRODUCTS HIN Decoder — MIC ATQ
Hull Identification Numbers beginning with ATQ were assigned by the US Coast Guard to HALCYON MARINE PRODUCTS of ANNAPOLIS, MD. The company is recorded as out of business since 2002 — 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
ATQ
Location
ANNAPOLIS, MD
In business
since 1984
Status
Out of business (2002)
HALCYON MARINE PRODUCTS built hulls across both HIN eras (1984–2002): 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.
How a HALCYON MARINE PRODUCTS HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example ATQ45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | ATQ | Identifies HALCYON MARINE PRODUCTS, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | HALCYON MARINE PRODUCTS's own production number for the specific hull (the letters I, O, Q are never used). |
| 9 | Certification month | D | Month built — A=January … L=December (D = April). |
| 10 | Certification year | 4 | Last digit of the certification year. |
| 11–12 | Model year | 24 | The boat’s model year. |
Free · no account · the HIN is on the transom, upper starboard (right) corner
Buying this HALCYON MARINE PRODUCTS? Check it before you pay.
HALCYON MARINE PRODUCTS is recorded out of business (2002) — which affects recalls, parts support, and resale. The $9.99 Boat Report adds the full CPSC marine-recall check, a HIN consistency check, a verify-before-you-buy checklist, and the USCG builder record for this hull — one downloadable report, one-time, no subscription. See what's included
HALCYON MARINE PRODUCTS HIN FAQ
What does a HALCYON MARINE PRODUCTS HIN look like?
It starts with the three characters "ATQ" — the Manufacturer Identification Code the US Coast Guard assigned to HALCYON MARINE PRODUCTS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. HALCYON MARINE PRODUCTS built hulls across both HIN eras (1984–2002): 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 HALCYON MARINE PRODUCTS still in business?
USCG records list HALCYON MARINE PRODUCTS as out of business since 2002. 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 HALCYON MARINE PRODUCTS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. HALCYON MARINE PRODUCTS built hulls across both HIN eras (1984–2002): 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.
Where is the HIN on a HALCYON MARINE PRODUCTS boat?
On the outside upper-starboard (right) corner of the transom, within two inches of the top — required by 33 CFR 181.29. Since August 1984 an identical duplicate HIN is also molded into an unexposed interior location as an anti-theft measure. Both should match the title, registration, and insurance card exactly.
Is the "ATQ" MIC the same as a HALCYON MARINE PRODUCTS serial number?
No. "ATQ" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies HALCYON MARINE PRODUCTS. The hull serial number is characters 4–8: HALCYON MARINE PRODUCTS's own production number for that specific boat (the letters I, O, and Q are never used). The full 12-character HIN combines the MIC, the serial, and the date code.
Can a HALCYON MARINE PRODUCTS HIN tell me the exact model?
Not on its own. A HIN encodes the builder, hull serial, certification month/year, and model year — not the model name or length. Match the decoded year and serial against HALCYON MARINE PRODUCTS records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in MD
Sources: verified against the USCG Manufacturer Identification Code database (refreshed monthly) · HIN format per 33 CFR Part 181, Subpart C. Reviewed by Sam Reynolds, Lead Researcher, CarWhere. Cite this page: CarWhere, "HALCYON MARINE PRODUCTS HIN Decoder," carwhere.com/hin-decoder/atq, last verified 2026-06-15.