Find the point halfway along the great-circle arc between two coordinates.
Coordinate calculations run locally in your browser. Great-circle distance, bearing, midpoint, destination, and radius tools use a spherical Earth model (mean radius 6,371,008.8 m), so survey-grade ellipsoidal/geodesic results can differ slightly.
Calculate the spherical midpoint and verify great-circle distance, bearing symmetry and near-antipodal instability.
Reuse the same spherical coordinate engine to review DD/DMS midpoint, total and half distance, initial bearing, and a local route sketch before opening the result in a map.
The sketch is a coordinate projection for verification, not a road or travel-time map.
Latitude/longitude order, hemisphere, datum and precision can all change the interpreted location. WebToolArc keeps WGS84 assumptions visible and separates conversion math from geocoding.
A formatted coordinate can look plausible while being swapped, rounded too aggressively or interpreted in the wrong system. Decode or open a map link before importing important points elsewhere.
Use the tool first, then use these checks to interpret, verify and hand off the result without displacing the primary workflow.
Latitude and longitude swaps can produce a valid-looking point on the wrong continent. Verify both input pairs, hemisphere signs, and the intended datum before interpreting the midpoint. Copy the midpoint together with its DD or DMS label so another map or GIS tool receives the same coordinate convention.
The geographic midpoint should lie halfway along the spherical shortest path, so each half of the great-circle distance should be approximately equal. Use the distance and bearing evidence as a quick geometry check, especially for long routes where simply averaging latitude and longitude can be badly misleading.
A browser-local route sketch is useful for spotting hemisphere, dateline, and endpoint mistakes, but it is not a street map and does not show roads, terrain, borders, or travel time. Open the midpoint in a mapping service when the decision depends on real transportation or nearby places.
When endpoints are almost opposite each other on the globe, many nearly equal shortest paths exist and the midpoint direction becomes numerically sensitive. Record the central-angle warning and avoid presenting one midpoint as uniquely meaningful in that geometry. A specialized geodesic workflow may be preferable for precision navigation.
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