{
  "name": "Calibration card: the nautical mile",
  "desc": "The values in the Calibration card at the top of the page, one field per row, with the source of each value.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/units/nautical-mile/",
  "from": [
    "BIPM, The International System of Units (SI Brochure), 9th edition, V4.01 (June 2026), Table 8 and note (k): 1 nautical mile = 1852 m; 1 knot = (1852/3600) m/s",
    "NBS Special Publication 447, Appendix 3 (U.S. conversion tables of March 21, 1894) and Appendix 4 (NBS Technical News Bulletin, August 1954): U.S. nautical mile 1,853.248 m (6,080.20 ft); British Admiralty 6,080 British feet",
    "Federal Register 24 FR 5348 (1959) and NIST Handbook 44 (2026), Appendix C, note 21: 1852 m = 6,076.11549 international feet (approximately); effective July 1, 1954 in the U.S. Commerce and Defense departments",
    "BIPM, SI Brochure, 8th edition (2006), Table 8, note (d)"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "Values from U.S. government publications (NBS SP 447, NIST Handbook 44, NIST SP 811, 24 FR 5348; public domain) and the BIPM SI Brochure, 9th ed. V4.01 (CC BY 4.0; adapted: values restated, not the table); compiled and partly computed 2026-11-01, CC BY 4.0"
  ]
}