{
  "slug": "nautical-distance",
  "title": "Nautical Distance & ETA Calculator",
  "heading": "Nautical Distance & ETA Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/nautical-distance",
  "summary": "Passage time from distance and boat speed.",
  "description": "Enter nautical miles and speed over ground to get passage hours, plus a current-adjusted estimate.",
  "formula": null,
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=nautical-distance",
  "inputs": [
    {
      "id": "nm",
      "label": "Distance",
      "kind": "number",
      "hint": null,
      "default": 45,
      "unit": "nm",
      "min": null,
      "max": null
    },
    {
      "id": "speed",
      "label": "Boat speed",
      "kind": "number",
      "hint": null,
      "default": 6.5,
      "unit": "kts",
      "min": null,
      "max": null
    },
    {
      "id": "current",
      "label": "Current with (+) / against (−)",
      "kind": "number",
      "hint": null,
      "default": -0.5,
      "unit": "kts",
      "min": null,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "hours",
      "label": "Passage time (hours)",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "sog",
      "label": "Speed over ground (kts)",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "statute",
      "label": "Statute miles",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "km",
      "label": "Kilometers",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Distance: 45 nm",
      "Boat speed: 6.5 kts",
      "Current with (+) / against (−): -0.5 kts"
    ],
    "outputs": [
      "Passage time (hours): 7.5",
      "Speed over ground (kts): 6",
      "Statute miles: 51.8",
      "Kilometers: 83.3"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter distance (nm).",
      "Enter boat speed (kts).",
      "Enter current with (+) / against (−) (kts).",
      "Read your passage time (hours) on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "nm": 27,
        "speed": 3.9,
        "current": -0.3
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "nm": 45,
        "speed": 6.5,
        "current": -0.5
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "nm": 72,
        "speed": 10.4,
        "current": -0.8
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How does the nautical distance & eta calculator work?",
      "a": "Enter nautical miles and speed over ground to get passage hours, plus a current-adjusted estimate."
    },
    {
      "q": "What do I need to enter?",
      "a": "3 values: distance, boat speed, and current with (+) / against (−). Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the passage time (hours) result mean?",
      "a": "It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/anchor-rode-scope"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Nautical Distance & ETA Calculator (https://www.revenuelab.fyi/toolbox/nautical-distance)"
}