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Magnetic Declination Bearing Correction Calculator — result sheet
Convert a magnetic bearing to a true bearing using a supplied local magnetic declination value.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: True bearing = magnetic bearing + declination, normalized to 0°–360°.
A compass follows magnetic north while a map bearing is referenced to true north. This calculator applies an entered declination with east treated as positive and west as negative, then wraps the answer to a conventional bearing. It intentionally does not guess declination from country, latitude, longitude, or date.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Magnetic bearing — °; minimum 0; maximum 360
- Magnetic declination — °; minimum -180; maximum 180
Worked example
| Input | Value |
|---|---|
| Magnetic bearing | 30 |
| Magnetic declination | 5 |
A 30° magnetic bearing with 5° east declination corresponds to a 35° true bearing.
Assumptions and limits
- The declination value is appropriate for the location and date of the observation and uses the stated east-positive sign convention.
- The magnetic bearing and declination are expressed in degrees and the result is a horizontal bearing.
- Local magnetic anomalies, compass deviation, grid convergence, instrument error, and a live geomagnetic model are not calculated.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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