Radar Horizon Calculator — Examples

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Overview

The Radar Horizon Calculator helps you perform accurate maritime calculations quickly, using standard nautical relationships and clear inputs.

How to use

Start by filling in the fields for the Radar Horizon Calculator; the page recalculates as you type so you can iterate through options in one place.

Formula

The relationship behind this tool is: d (nm) ≈ 1.23 × √(h), h in meters (approximate)

Empirical radar horizon approximation; target detectability also depends on power, sea clutter, and target height.

Practical use cases

Typical uses for the Radar Horizon Calculator include passage planning, briefing crew, converting instrument readouts to chart units, and double-checking mental math when fatigue or weather make errors more likely.

Tips for accuracy

• Confirm that the units you enter match your chart, GPS, or instrument readout before relying on the Radar Horizon Calculator.
• In rough weather or poor visibility, cross-check important results with a second method or a crew member.
• Treat simplified models (wave height, radar horizon, etc.) as estimates—real conditions vary with fetch, refraction, and equipment.

Practical examples

• 12 m scanner → ~4.3 nm to sea surface (rough)

Frequently Asked Questions

• How accurate is this calculator?

  This calculator uses standard maritime formulas and practical approximations where noted. It is suitable for planning and cross-checks; always verify safety-critical decisions with official references and local conditions.

• Can I use this on mobile?

  Yes. OceanCalc tools are responsive and work on phones and tablets for quick checks on deck or in the cockpit.

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