## Formula:

The Compass Rule Adjustment Calculator relies on a relatively simple formula to adjust compass readings. The formula is as follows:

Where:

• Magnetic Declination represents the angle between true north (geographic north) and magnetic north at your specific location.

## How to Use?

Using the Compass Rule Adjustment Calculator is a straightforward process. Follow these steps to make compass adjustments:

2. Determine the magnetic declination for your location. This information is often available from maps, online tools, or through your navigation equipment.
3. Enter the magnetic declination, ensuring it is positive for east declination and negative for west declination.
4. Click the “Calculate” button.

## Example:

Let’s consider a practical example to illustrate how the Compass Rule Adjustment Calculator works. Imagine you’re sailing in the Pacific Ocean near San Francisco, California, and your compass indicates a magnetic heading of 45 degrees. You consult a reliable source and find that the magnetic declination for your location is 14 degrees east.

1. Input the magnetic heading: 45 degrees
2. Enter the magnetic declination: +14 degrees (for east declination)
3. Click “Calculate”

The calculator will show an adjusted heading of 59 degrees. This means you should set your course to 59 degrees to follow a true north direction accurately.

## FAQs?

A1: Compass readings are affected by the Earth’s magnetic field, which varies from one location to another. To navigate accurately, it’s essential to correct your readings by accounting for the magnetic declination specific to your area.

Q2: How can I find the magnetic declination for my location?

A2: You can typically find magnetic declination information on maps, GPS devices, and online tools. The National Oceanic and Atmospheric Administration (NOAA) in the United States provides magnetic declination data for various locations.