About Great Circle Distance Calculator
Spherical trigonometry navigation calculator. Compares the shortest curved Great Circle path against constant-compass Rhumb Lines (loxodromes). Generates intermediate navigation waypoints (25%, 50%, 75%), initial/final bearings, and antipodal coordinates.
Key Capabilities & Features
- Side-by-side comparison of Great Circle curved geodesic distance versus constant-compass Rhumb Line
- Initial forward departure bearing and final arrival bearing calculations
- Intermediate waypoint interpolation along the Great Circle arc (quarter, midpoint, and three-quarters)
- Calculates exact antipodal coordinates (diametrically opposite point on Earth)
How to Use Great Circle Distance Calculator
Set Start & End Coordinates
Enter Point 1 and Point 2 latitudes and longitudes.
Compare Great Circle vs Rhumb
See how many kilometers the curved Great Circle route saves compared to a constant compass heading.
Inspect Waypoints
Review interpolated intermediate navigation waypoints and antipodal coordinates.
Privacy & In-Browser Execution Guarantee
100% client-side calculation. Your data never leaves your browser.
Frequently Asked Questions
What is a Rhumb Line?
A Rhumb Line (or loxodrome) is a path that crosses all meridians of longitude at the same angle, allowing a ship or aircraft to follow a constant compass heading.
Why is Great Circle distance shorter than a Rhumb Line?
On a spherical surface, the shortest distance between two points is an arc of a great circle whose center coincides with the center of the Earth.