Boat Serial Number decodes 12-character hull identification numbers into builder code, serial, build month and year, and model year. It dates outboards from Mercury, Yamaha, Evinrude/Johnson and Honda codes (Honda covers 1998 to 2006 only), reads shaft-length codes and explains Sea-Doo HIN locations.
It also covers warning codes for Mercury 15/20 EFI and 2025 Sea-Doo, and oil capacities for Mercury 40/50/60 and Yamaha F115. It does not check ownership, liens or theft, and gives no used-boat values. Not affiliated with the U.S. Coast Guard or any boat, engine or personal watercraft manufacturer.
The goal is to make these references easier to find and keep coverage limits visible. The site links to source material instead of guessing unsupported answers.