Quick Answer
The accuracy of a shadow stick navigation technique is affected by the time of day, atmospheric conditions, observer's skill level, and the shadow stick's angle of inclination.
Atmospheric Conditions
Atmospheric conditions such as temperature, humidity, and air pressure can affect the shadow stick’s accuracy. High temperatures and low humidity can cause the air to expand, making the shadow appear shorter. Conversely, low temperatures and high humidity can cause the air to contract, making the shadow appear longer. These variations can result in an error of up to 10 degrees.
Observer’s Skill Level
The observer’s skill level is a critical factor in determining the accuracy of the shadow stick technique. A skilled observer can account for atmospheric conditions, the shadow stick’s angle of inclination, and other factors to achieve a high degree of accuracy. In contrast, an inexperienced observer may struggle to accurately estimate the direction of the sun, leading to significant errors.
Shadow Stick Angle and Time of Day
The angle of the shadow stick and the time of day are also crucial factors in determining accuracy. The shadow stick should be held at an angle of approximately 20-30 degrees to the sun. At noon, the shadow stick’s angle of inclination will be closest to the sun’s altitude, resulting in the most accurate estimate of direction. However, as the time of day deviates from noon, the shadow stick’s angle of inclination will also change, requiring adjustments to be made to the estimate of direction.
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