MSL101L04 Basic Map Reading SR.pdf lesson 4.pdf

5 12 to measure distance along a road stream or other

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5-12. To measure distance along a road, stream, or other curved line, the straight edge of a piece of paper is used. In order to avoid confusion concerning the point to begin measuring from and the ending point, an eight-digit coordinate should be given for both the starting and ending points. Place a tick mark on the paper and map at the beginning point from which the curved line is to be measured. Align the edge of the paper along a straight portion and make a tick mark on both map and paper when the edge of the paper leaves the straight portion of the line being measured. (See A, Figure 5-5.) 5-13. Keeping both tick marks together (on paper and map), place the point of the pencil close to the edge of the paper on the tick mark to hold it in place. Then, pivot the paper until another straight portion of the curved line is aligned with the edge of the paper. Continue in this manner until the measurement is completed. (See B, Figure 5-5.) 5-14. When the distance is completely measured, move the paper to the graphic scale to determine the ground distance. The only tick marks being measured are (a) and (b). The tick marks in between are not used. (See C, Figure 5-5.)
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Scale and Distance 15 November 2013 TC 3-25.26 5-5 Figure 5-5. Measuring a curved line 5-15. There may be times when the distance being measured on the edge of the paper exceeds the graphic scale. In this case, there are different techniques that can be used to determine the distance: One technique is to align the right tick mark (b) with a printed number in the primary scale, in this case the 5. From point (a) to point (b) is more than 6000 m when the 1000 m in the extension scale is added. To determine the exact distance to the nearest 10 m, place a tick mark (c) on the edge of the paper at the end of the extension scale. (See A, Figure 5-6.) Point (b) to point (c) is 6000 m. With the tick mark (c) placed on the edge of the paper at the end of the extension scale, slide the paper to the right. (Remember the distance in the extension is always read from right to left.) Align tick mark (c) with zero and then measure the distance between tick marks (a) and (c). The distance between tick marks (a) and (c) is 420 m. The total ground distance between start and finish points is 6420 m. (See B, Figure 5-6.)
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Chapter 5 5-6 TC 3-25.26 15 November 2013 Figure 5-6. Determining the exact distance Another technique that may be used to determine exact distance between two points when the edge of the paper exceeds the bar scale is to slide the edge of the paper to the right until tick mark (a) is aligned with the edge of the extension scale. Make a tick mark on the paper, in line with the 2000-m mark (c). (See A, Figure 5-7.) Then slide the edge of the paper to the left until tick mark (b) is aligned with the zero. Estimate the 100-m increments into 10-m increments to determine how many meters tick mark (c) is from the zero line. (See B, Figure 5-7.) The total distance is 3030 m.
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