{
  "title": "Offset from the intended line after 100 miles for a steady course error",
  "description": "Illustrative calculation, not from any log: miles off the intended line after 100 miles run with a course error held steady, on a flat plane with no current or leeway (offset = 100 × sine of the error). The last row gives the size of one compass point as worked from Bowditch (1802).",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "creator": "From the Surviving Record",
  "page": "https://fromthesurvivingrecord.com/shipwrecks/dead-reckoning/",
  "derived_from": [
    "Illustrative calculation for this page",
    "Nathaniel Bowditch, The New American Practical Navigator (Newburyport, Mass., 1802), pages named in each label or row (p. 241)"
  ],
  "method": "Compiled by From the Surviving Record from the data listed",
  "data_credit": [
    "Nathaniel Bowditch, The New American Practical Navigator (Newburyport, 1802), retrieved 2026-11-01, public domain"
  ]
}