Nautical Bearing Calculator
Nautical Bearing Calculator is a focused utility for this exact calculation. Enter the requested values, review the result instantly, and check the method note before using it for planning or professional work.
Quick answer: Calculate initial compass bearing and nautical distance between two coordinate points. Coverage: Worldwide. No account is required.
Worked examples
- New York → London — The great-circle distance is about 5,570 km (3,461 mi), with an initial bearing of 51° (NE).
- Tokyo → Sydney — This pair is about 7,826 km apart on the sphere. It is a useful example of why flat maps distort long intercontinental routes.
- Paris → Berlin — The straight-line distance is about 877 km. Road distance is longer because real routes follow the transport network rather than the geometric minimum.
Limits & appropriate use
The honest limits here are about category, not quality: great-circle math is near-exact, but it answers 'how far over the surface', not 'how far as driven, flown or walked'. Airline distances follow airways and winds; odometers follow detours; hikers follow switchbacks. Quoting a straight-line number into a fuel budget is the classic misuse, which is why the tools keep the ladder visible — crow-flies, road, time — and label each rung. A second limit is definitional: 'city to city' means mapped centre to mapped centre, and a suburb-to-airport question is a different measurement wearing the same sentence.
Within those bounds the numbers are durable: reproducible from coordinates alone, stable across tools that use the same radius convention, and accurate to a fraction of a percent of geodetic truth. The escalation path is short and rarely needed — ellipsoidal libraries (Karney's algorithms) for survey-grade millimetres, the routing engine for network truth, and the airline's schedule for invoice truth. Knowing which authority owns which number is the entire craft of distance literacy.
- Survey-grade millimetres → ellipsoidal geodesic libraries, not sphere math.
- Fuel and schedule planning → road routing plus your congestion buffer.
- Airline invoicing → carrier distance tables (airways ≠ great circles).
Data & methodology
Uses spherical initial-bearing and great-circle distance equations. Distances and bearings use haversine great-circle math on the WGS84 mean sphere (R = 6371.0088 km), accurate to ~0.3% of ellipsoidal geodesics; the methodology page documents the full recipe.
For source details, licences and model limitations, see Data Sources and Methodology.
Related tools
Category: Distance & Bearing. Results are intended for everyday analysis and planning unless a page explicitly states otherwise.
How to use
- 1Enter the requested values.
- 2Review the calculated result.
- 3Check the method and assumptions before relying on the output.
Methodology & accuracy
Uses spherical initial-bearing and great-circle distance equations. Read more on the methodology page.
Frequently asked questions
What does this tool calculate?
Calculate initial compass bearing and nautical distance between two coordinate points.
Is it free to use?
Yes. No account is required.
How accurate is the result?
Uses spherical initial-bearing and great-circle distance equations.