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True Bearing from Magnetic Declination
Online true bearing from magnetic declination. User-supplied dated local declination; east positive, west negative.
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true bearing from magnetic declination calculator online
Use true bearing from magnetic declination online for magnetic bearing deg, east declination deg. User-supplied dated local declination; east positive, west negative. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
How to use it
Enter magnetic bearing deg. Set east declination deg. Select Calculate and check the labeled output. Copy or download the JSON result.
Options and example settings
Calculation method
true_bearing_deg = mod(magnetic_bearing_deg+east_declination_deg,360) (^ means exponentiation; trig functions ending in d use degrees).
Worked examples
Apply true bearing from magnetic declination to the case below, keeping the displayed units and assumptions. User-supplied dated local declination; east positive, west negative.
True Bearing from Magnetic Declination — worked case
Settings: east declination deg: 5
Input:
120
Calculated result for these inputs:
Output:
{
"true_bearing_deg": 125
}Choose the right tool
Choose great-circle tools for shortest spherical paths and rhumb tools for constant bearings. Spherical models differ from ellipsoidal survey calculations. Web-map tiles have latitude limits and grid bearings require a stated convergence convention.
Limitations and common mistakes
- User-supplied dated local declination; east positive, west negative. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Use the displayed unit in every field. Ratios and percentages are different inputs; percent fields use values such as 25 rather than 0.25.
Frequently asked questions
How can I use true bearing from magnetic declination calculator online?
Enter magnetic bearing deg. Set east declination deg. Select Calculate and check the labeled output. Copy or download the JSON result.
Technical references
Where is my input processed?
The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.
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