Great Circle Initial Bearing
Initial spherical great-circle bearing from the first latitude/longitude to the second, normalized to [0,360).
Description
Initial spherical great-circle bearing from the first latitude/longitude to the second, normalized to [0,360).
Great Circle Initial Bearing: Initial spherical great-circle bearing from the first latitude/longitude to the second, normalized to [0,360).
When to use Great Circle Initial Bearing
Use this cartographic calculation to convert, scale, or compare map, terrain, bearing, raster, or route quantities when the coordinate and unit conventions are explicitly known.
- Latitude1Degrees (deg)
- Required number input.
- Longitude1Degrees (deg)
- Required number input.
- Latitude2Degrees (deg)
- Required number input.
- Longitude2Degrees (deg)
- Required number input.
How Great Circle Initial Bearing works
Initial spherical great-circle bearing from the first latitude/longitude to the second, normalized to [0,360). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.1
- Bearing Degrees (deg)
- The resulting bearing degrees returned as a number.
Limitations and assumptions
- Map calculations depend on datum, projection, latitude, scale definition, magnetic-declination epoch, and whether distances are planar, rhumb-line, or geodesic. A compact formula cannot remove distortion or infer the missing reference system.
- Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.
Alternative or Complementary approaches
Confirm the map datum, projection, scale, and bearing convention before applying the result. Use geodesic or GIS software with current reference data when survey-grade or navigation-critical accuracy is required.
References
-
Bearing (navigation) — Wikipedia contributors
Similar or alternative tools
- Back Bearing Calculator
Reverse azimuth, normalized to [0,360), from a forward azimuth in degrees.
- Haversine Distance Cartography
Spherical great-circle distance in kilometres using a user-supplied Earth radius.
- Longitude Degree To Km Departure
Approximate east-west kilometres per longitude degree at latitude on a spherical Earth.