Why Should You Reassess Your Compass Skills Annually?

Magnetic Declination

Magnetic declination, also known as magnetic variation, is a measure of the difference between the Earth’s magnetic field and true north. This value can change annually due to the movement of the Earth’s magnetic field poles. Ignoring these changes can result in navigational errors, potentially leading to getting lost. In the United States, for example, the average annual change in magnetic declination is around 30-40 kilometers, which translates to approximately 1-2 degrees of change. It’s essential to check the current declination value for your location, which can be found on a magnetic declination chart or through online resources.

Navigation Technique Improvement

As a navigator, it’s essential to continually assess and refine your skills. Annual reassessment allows you to identify areas of improvement and fine-tune your technique. This may involve practicing with different types of compasses, learning new navigation methods, or simply refreshing your knowledge of magnetic declination and other navigation fundamentals. By doing so, you can maintain your confidence and accuracy in navigation. For example, practicing with a compass in different lighting conditions can help you develop muscle memory and improve your ability to take accurate readings.

Compass Calibration and Maintenance

Regularly checking and maintaining your compass is crucial to ensure accuracy. This includes verifying that the compass is calibrated correctly, checking for any signs of magnetic interference, and ensuring the compass is not damaged. Typically, a compass should be calibrated every 10-20 years, depending on the manufacturer’s recommendations and the compass’s exposure to magnetic fields. However, even if your compass is calibrated, it’s still essential to reassess your skills annually to ensure you’re using the compass effectively.