Quick Answer
You can use a compass effectively in heavy rain, but you need to take precautions to prevent damage and ensure accurate readings.
Understanding Compass Declination
Declination is a critical factor when using a compass, and it’s essential to account for it, especially in heavy rain. Most compasses have a rotating bezel that allows you to adjust for declination, which varies by location. For example, in the contiguous United States, declination ranges from -20 to 20 degrees, while in Alaska, it can be as high as +30 degrees.
Preparing for Heavy Rain
To use a compass effectively in heavy rain, make sure it’s properly sealed and protected from water. Check the compass for any signs of water infiltration, and if it’s damaged, consider replacing it. Keep the compass in a dry, waterproof pouch or bag when not in use. In heavy rain, use a shelter or lean-to to protect the compass from direct rain exposure.
Navigation Techniques in Heavy Rain
When using a compass in heavy rain, aim for a “shadow” or a slightly elevated position to reduce water splashing onto the compass. Take readings quickly and confidently, and avoid handling the compass excessively, which can cause damage or water infiltration. Use the compass in conjunction with other navigation tools, such as a map and altimeter, to increase accuracy and confidence in your navigation.
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