Quick Answer
For accurate readings, your shadow stick should stick to the ground at an angle between 40 and 50 degrees with the sun at a minimum of 60 degrees above the horizon, indicating an optimal duration of approximately 1 to 2 minutes.
Understanding Shadow Stick Navigation
Shadow stick navigation is a simple yet effective method for determining direction. When the sun is high enough (above 60 degrees), you can use your shadow stick to estimate direction. This technique relies on the shadow stick’s angle and the time it takes for the shadow to change, but it requires a reliable initial reference.
Measuring Shadow Angle and Duration
To use the shadow stick method, find a straight stick or object and place it in the ground. Mark the end of the shadow with a small rock or stick. Wait for 1 to 2 minutes and mark the new end of the shadow. Draw an imaginary line between the two marks. The midpoint of this line represents the direction south, assuming you are in the Northern Hemisphere. In the Southern Hemisphere, the midpoint represents the direction north. In both cases, the shadow stick’s angle is around 40 to 50 degrees at the correct time.
Time and Shadow Stick Adjustments
The optimal duration of 1 to 2 minutes is crucial for accurate readings. If the sun is too high (above 75 degrees), the shadow stick’s angle may be less reliable. Conversely, if the sun is too low (below 45 degrees), the shadow stick’s angle may be too shallow. To adjust for these conditions, consult a sun compass or a watch with a directional bezel. Always keep in mind that the shadow stick method is most accurate when used in conjunction with other navigation techniques and in combination with landmarks, topography, and a compass.
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