Maritime vs. Highway Identification Standards
While both systems identify manufactured transportation assets, motor vehicle identification is governed by the National Highway Traffic Safety Administration (NHTSA), whereas marine vessel identification is federally regulated by the United States Coast Guard (USCG) under Title 33 CFR Part 181.
Structural Comparison: 12 Characters vs. 17 Characters
- Length: Automotive VINs have exactly 17 characters; federal boat HINs contain exactly 12 alphanumeric characters.
- Manufacturer Identification: Cars use a 3-character WMI issued by SAE; boats use a 3-character Manufacturer Identification Code (MIC) issued by the USCG.
- Model Year Placement: Vehicle VINs encode the year in character 10; modern boat HINs place model year digits in the final two positions (11 and 12).
The Standard Post-1984 HIN Format
All vessels built after August 1, 1984 adhere to the Current Format:
- Characters 1–3 (MIC): Identifies the builder (e.g., "SER" for Sea Ray, "YDV" for Yamaha, "TRK" for Tracker Marine).
- Characters 4–8 (Serial Number): Five-character hull sequence chosen by the boat manufacturer.
- Character 9 (Certification Month): Letter code from A (January) through L (December).
- Character 10 (Certification Year): Final digit of the calendar year built (e.g., "4" for 2024).
- Characters 11–12 (Model Year): Two-digit official vessel model year.
Hull Stamping Mandate
Federal law requires the primary HIN to be permanently affixed to the upper starboard (right) outboard side of the transom within 2 inches of the top edge or rub rail.