Quick Answer
A compass is more useful than a GPS device when signals are weak or unreliable, such as in remote areas with dense foliage or near tall buildings, and when the device is dead or out of power. In these situations, a compass can provide a more reliable means of navigation. However, it requires proper calibration to account for declination.
Understanding Compass Declination
Compass declination refers to the difference between magnetic north and true north. This discrepancy can be significant, with some areas experiencing a 10-15 degree difference. To navigate accurately, it’s essential to know the declination for your location and adjust your compass accordingly. You can find declination information online or consult a map.
Calibrating Your Compass
To calibrate your compass, find a location with a known magnetic north direction, such as a park or a known landmark. Hold the compass level and rotate it until the magnetic needle aligns with the direction-of-travel arrow. Then, adjust the declination by turning the declination bezel to match the known difference between magnetic and true north. This will ensure your compass readings are accurate.
Navigating with a Compass
When using a compass for navigation, it’s essential to understand the relationship between the compass and the map. The direction-of-travel arrow on the compass should point towards the location you want to reach. To follow a course, align the direction-of-travel arrow with the map’s grid lines and move in the direction indicated by the arrow. Regularly check your position and adjust your course as needed to stay on track.
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