1. What is Magnetic Field Declination?

Magnetic declination is the angle between magnetic north and true north. It varies by location and changes over time due to movements in Earth's magnetic field.

2. How Does the Calculator Work?

The calculator uses the declination formula:

Where:

• \( X \) — North component of the magnetic field (nT)
• \( Y \) — East component of the magnetic field (nT)

Explanation: The arctangent function calculates the angle whose tangent is the ratio of the east component to the north component.

3. Importance of Declination Calculation

Details: Accurate declination values are crucial for navigation, surveying, and any application requiring precise orientation relative to true north.

4. Using the Calculator

Tips: Enter the north (X) and east (Y) components of the magnetic field in nanoteslas (nT). Both values are required for calculation.

5. Frequently Asked Questions (FAQ)

Q1: What units are used for magnetic field components?
A: The calculator uses nanoteslas (nT) for both X (north) and Y (east) components.

Q2: How precise is this calculation?
A: The calculation is mathematically precise, but actual field measurements may have instrument errors.

Q3: What does a positive declination mean?
A: Positive declination means magnetic north is east of true north.

Q4: How often does declination change?
A: Declination changes gradually over time due to secular variation in Earth's magnetic field.

Q5: Is this the same as magnetic variation?
A: Yes, magnetic declination is also called magnetic variation in navigation contexts.