Can Declination Cause You to Get Lost in the Wilderness?

Understanding Declination

Declination is the difference between magnetic north and true north. In the United States, declination ranges from -20 degrees to 20 degrees. If you’re using a compass to navigate, it’s essential to understand and adjust for declination to ensure your route is accurate. In areas with high declination, a 1-degree error can result in a 100-foot discrepancy in your route.

Measuring and Adjusting for Declination

To adjust for declination, you need to know the declination for your location. You can find this information on a USGS topographic map or by using an online declination calculator. Once you have the declination value, you can adjust your compass by rotating the bezel to the correct declination value. For example, if the declination is 10 degrees east, you would rotate the bezel 10 degrees clockwise. It’s also essential to understand that declination can vary depending on your location, so it’s crucial to adjust for declination at regular intervals when navigating.

Using a Compass in the Wilderness

When using a compass in the wilderness, it’s essential to use the declination-adjusted value to ensure accuracy. When taking a bearing, make sure to use the adjusted declination value to avoid errors. Additionally, it’s also important to use a combination of navigation methods, including a map, compass, and landmarks, to ensure you stay on track. By understanding and adjusting for declination, you can increase your chances of staying safe and found in the wilderness.