Sources and methodology
The public pages use official US marine-engine and port records and make their limitations explicit.
source
ledger
2026-09-03
ledger
2026-09-03
Core public sources
- EPA marine compression-ignition archive. Historical certified engine models, parts and family records. Official workbook.
- EPA marine spark-ignition archive. Historical certified engine records. Official workbook.
- EPA annual certification data. Current certification-data landing page and release context. Official source.
- NGA World Port Index. Official port identity and published service indicators, projected here only as country-level counts. Official source.
- US Coast Guard manufacturer identification. Manufacturer identity context only. Official directory.
Transformation
The EPA snapshot was retrieved on 24 July 2026. Rows are normalised by manufacturer, part-number identity and EPA family code. World Port Index records were retrieved on 29 August 2026 and aggregated by country without treating unknown fields as negative answers. The site does not infer compatibility, stock, price or interchangeability.
Corrections and stale data
Certification and port records are evidence of a published record, not proof of a current product or currently available service. Check the linked official source and manufacturer documentation before acting. Report a correction.