{
  "dataset": "navigation-lights",
  "title": "Navigation lights, with their characteristics parsed",
  "required_attribution": "Light data from the National Geospatial-Intelligence Agency, List of Lights, Pub. 110 through 116. The parse of each characteristic is by the Artificial Wasteland.",
  "not_for_navigation": "This dataset must not be used for navigation. It is a derived extract of a publication that is itself corrected weekly by Notice to Mariners, and no correction after the volumes below is reflected here.",
  "sources": [
    {
      "id": "src:nga-list-of-lights",
      "title": "List of Lights, Radio Aids and Fog Signals, Pub. 110 through 116",
      "publisher": "National Geospatial-Intelligence Agency (NGA), United States",
      "url": "https://msi.nga.mil/Publications/LOL",
      "accessed": "UNKNOWN",
      "accessed_status": "UNKNOWN: the volumes were committed to this repository as research/list-of-lights/data/pub11{0..6}.json.gz without a recorded retrieval date, and no fetch script exists. The newest Notice to Mariners year appearing on any kept row is 2024.",
      "licence_id": "US-GOV-PD",
      "licence": "Work of the United States Government, not subject to copyright protection in the United States (17 U.S.C. §105)",
      "licence_basis": "statute",
      "licence_note": "NO PUBLISHER NOTICE WAS FOUND. msi.nga.mil returns 404 for /robots.txt, its publications pages render by script and carry no copyright or terms text that a fetch can read, and we found no terms statement to quote. The claim therefore rests on the statute and on NGA being a United States Government agency compiling its own publication, not on anything the publisher told us. Checked 2026-09-04.",
      "role": "The light records: name, country, structure, position and the printed characteristic string."
    },
    {
      "id": "src:aw-characteristic-parse",
      "title": "The characteristic parse and position conversion",
      "publisher": "Artificial Wasteland",
      "url": "https://artwaste.land/tools/what-light/",
      "accessed": "2026-09-04",
      "licence_id": "CC0-1.0",
      "licence": "CC0 1.0 Universal",
      "licence_basis": "publisher-statement",
      "licence_note": "Ours to give: this project places its own derived fields in the public domain.",
      "role": "rhythm, groups, colours, period, phases, the decimal positions, the height and range rules, the identifier, and the period_status judgement."
    }
  ]
}