A divider compass is used to accurately measure distances on maps or transfer measurements from one place to another.
Here's a breakdown of how to use a divider compass, based on the provided reference:
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Set the Span: Open the divider so that the points span a specific distance. For example, use the latitude scale on a map to set the divider to represent 10 nautical miles (or any other desired unit of measurement). The video specifically mentions using the latitude scale closest to point A.
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"Walking" the Dividers: Place one point of the divider on the starting point of the distance you want to measure (e.g., point A). Then, pivot the other point down to mark a new location along the course or line you are measuring. Keep one point in place, and move the other point by pivoting. Repeat this process, "walking" the dividers along the course.
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Counting Intervals: Count the number of times you "walk" the dividers from the start to the end point. Each interval represents the distance you set the divider to (e.g., 10 nautical miles per interval).
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Calculate Total Distance: Multiply the number of intervals by the distance each interval represents. This will give you the approximate total distance. For example, if you "walked" the dividers 5 times, and each interval was set to 10 nautical miles, the total distance is approximately 50 nautical miles.
In essence, a divider compass transforms a long, possibly curved distance into a series of equal, straight-line segments that you can easily count and then convert to a meaningful measurement. It's essential to use a scale that's appropriate for the map projection you are using for greatest accuracy.
