Quick Answer
A magnetic compass can be a reliable navigation tool in survival situations, but its accuracy depends on understanding its limitations and declination.
Understanding Magnetic Declination
Magnetic declination is the difference between magnetic north and true north. It varies significantly depending on your location and can be as much as 20-30 degrees. To accurately navigate, you need to know the declination for your area and adjust your compass accordingly. You can find declination values online or on topographic maps.
Using a Magnetic Compass Effectively
To use a magnetic compass effectively in survival situations, first, ensure it’s a reliable, durable tool. Then, learn how to take a bearing by aligning the direction-of-travel arrow with the magnetic needle and the magnetic north indicator. Use natural navigation aids like the sun, stars, and landmarks to supplement your compass readings. In addition, always take into account the declination value for your area when taking bearings.
Compensation Techniques
To compensate for declination, you can use a declination card or online resources to determine the declination value for your location. Then, add or subtract the declination value from your compass reading to obtain a true bearing. For example, if the declination is 20 degrees east and your compass reading is 270 degrees, your true bearing would be 250 degrees.
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