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Second, for the purposes of this exercise, the winds do not have any significant speed changes. 

Prior to starting the plot, a scale depicting the wind speed must be established. In this example illustrated, two squares on the graph paper will represent a wind speed of 5 miles per hour (mph). In the absence of a wind meter, or other accurate wind reading, a rough estimate of the wind speed may be made using the technique shown in Figure 3-5 . 

To begin plotting the pibal recording information, release the pibal and track it with the compass. After 30 seconds, take a reading and make a mark on the graph paper to represent the start point. Make a second mark to represent the direction plotted. In Figure 3-6,  a track of 300° at 5 mph is depicted. Label the first two points “A” and “B.” [Figure 3-6] 

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At 1 minute, take a second reading. The pibal will be at approximately 300 feet AGL. In this example, the reading take n is 310°. Using the plotter, draw a line 10° off the origi nal azimuth (the A-B line), and make another mark appr oximately two squares away from the mark labeled “B.” For clarity, this is be labeled “C”. See the example in F igur e 3-7.  (NOTE: The angles in the successive graphics are exaggerated for clarity.) 

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Figure 3-1B. Plotting your course. At 1:30 minutes, take another reading. The pibal will be at appr oximately 450 feet. Using the plotter, draw a line 30° off the original azimuth (the A-B line), and make another mark appr oximately two squares away from the mark labeled “C.” This mark may be labeled “D” for clarity. [Figure 3-8] 

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