Quick Answer
A compass is more reliable than GPS in certain situations, particularly when GPS signals are weak or unavailable, such as in deep valleys, near high-rise buildings, or in areas with dense tree cover.
Understanding Compass Reliability
Compasses have been used for navigation for centuries and rely on the Earth’s magnetic field to determine direction. While GPS devices can provide location and altitude information, they require a clear view of the sky and are susceptible to signal interference. A good compass, on the other hand, can be held in the hand and provide accurate direction information, even in dense forests or urban areas.
Compass Techniques for Backup Navigation
To use a compass effectively, it’s essential to understand how to take a bearing and navigate using a map. The first step is to identify a landmark or a feature on the map, such as a mountain or a river. Then, hold the compass level and rotate the bezel until the magnetic needle aligns with the direction-of-travel arrow. Next, turn the map until the landmark or feature on the map aligns with the direction-of-travel arrow on the compass. The bearing can then be read from the compass dial, allowing you to navigate to the desired location.
Selecting the Right Compass for the Job
When choosing a compass for backup navigation, look for a high-quality model with a clear and durable design. The Suunto M-3 Global or the Silva Ranger are excellent options for wilderness navigation. These compasses feature a rotating bezel, a clear direction-of-travel arrow, and a robust design that can withstand rough handling. Additionally, consider a compass with a declination adjustment feature, which allows you to account for the difference between magnetic and true north. With the right compass and a little practice, you can rely on a compass as a backup to GPS navigation in a variety of situations.
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