Why Does Declination Change Depending on Your Location?

Understanding Declination

Declination is the difference between true north and magnetic north, which is crucial for navigation using a compass. It varies depending on your location due to the Earth’s irregular magnetic field. The Earth’s magnetic field is generated by movements within its core, resulting in a non-uniform magnetic field that changes over time.

Factors Influencing Declination

Declination is influenced by two main factors: magnetic latitude and the Earth’s magnetic field’s irregularities. Magnetic latitude is the angle between a location’s magnetic north and its geographic north. As you move towards the equator, the magnetic field’s strength decreases, causing declination to change. In areas with high magnetic latitude, declination is more pronounced, while near the equator, it is negligible.

Measuring and Accounting for Declination

To navigate accurately, it’s essential to know the declination for your specific location. You can find declination values for different areas using online resources or a declination chart. When using a compass, you can adjust the declination by adding or subtracting the value from your compass. For example, if the declination is +20 degrees, you would adjust your compass by adding 20 degrees to the magnetic north to get the true north direction.