Quick Answer
You can rely on a compass alone in certain situations, but it's crucial to understand its limitations. To use a compass effectively without a map, you need to know how to set a bearing, read magnetic declination, and navigate using landmarks.
Understanding Magnetic Declination
Magnetic declination is the difference between magnetic north and true north. In the United States, declination ranges from -20 to 20 degrees. To use a compass, you need to know your local declination value. Check the declination for your area at a geographical information website or consult a topographic map. This value will be essential for setting a bearing and navigating.
Setting a Bearing
To set a bearing, you need to determine the direction of your destination. Hold the compass level and rotate the bezel until the magnetic needle aligns with the direction-of-travel arrow. The compass dial will show the bearing in degrees. For example, if you need to travel 270 degrees to reach your destination, set the bezel to 270 and follow the direction-of-travel arrow.
Landmarks and Navigation
Landmarks can be used to navigate without a map. Identify distinctive features such as hills, valleys, or bodies of water that you can use as reference points. Use your compass to set a bearing and travel in a straight line until you reach a landmark. Once you’ve identified the landmark, use it to set a new bearing and continue navigating. When using landmarks, it’s essential to keep a visual reference point in sight to ensure you stay on course.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.