A graphic range is a ruler published on the map and also is offered to transform distances on the map come actual floor distances. The graphic scale is separated into 2 parts. To the ideal of the zero, the range is marked in complete units of measure and is dubbed the main scale. To the left the the zero, the range is separated into tenths and also is dubbed the extension scale. Most maps have three or much more graphic scales, each making use of a different unit that measure. Once using the graphic scale, be sure to usage the correct scale for the unit of measure desired.

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Using a graphic (bar) scale.

a. To identify straight-line distance between two clues on a map, place a straight-edged piece of record on the map so the the leaf of the file touches both points and also extends previous them. Do a tick mark on the sheet of the record at each point.

Transferring map street to document strip.

b. To transform the map distance to floor distance, move the document down come the graphic bar scale, and also align the best tick mark (b) v a printed number in the primary scale so the the left tick mark (a) is in the expansion scale.


Measuring straight-line map distance.

c. The best tick note (b) is aligned with the 3,000-meter note in the primary scale, for this reason the distance is at least 3,000 meters. To determine the distance between the 2 points to the nearest 10 meters, look at the expansion scale. The expansion scale is numbered with zero at the right and also increases come the left. Once using the extension scale, always read right to left. Indigenous the zero left come the beginning of the an initial shaded area is 100 meters. Indigenous the beginning of the shaded square to the end of the shaded square is 100 come 200 meters. Indigenous the end of the very first shaded square come the beginning of the second shaded square is 200 to 300 meters. Remember, the street in the extension scale increases from right to left.

d. To determine the distance from the zero to tick note (a), divide the distance inside the squares right into tenths. Together you malfunction the distance between the squares in the extension scale into tenths, you will see that tick mark (a) is aligned v the 950-meter mark. Adding the distance of 3,000 meters identified in the main scale come the 950 meter you figured out by using the expansion scale, we find that the total distance in between points (a) and (b) is 3,950 meters.

e. To measure up distance along a road, stream, or other curved line, the directly edge of a piece of file is used. In bespeak to stop confusion worrying the point to start measuring from and the ending point, one eight-digit coordinate need to be offered for both the beginning and finishing points. Location a tick note on the document and map in ~ the beginning allude from i m sorry the curved line is to be measured. Align the edge of the file along a straight section and do a tick mark on both map and file when the sheet of the paper leaves the straight section of the line being measured.


Measuring a curved line.

f. Maintaining both mite marks with each other (on document and map), location the suggest of the pencil close to the sheet of the paper on the tick mark to organize it in place and pivot the file until an additional straight section of the bent line is aligned v the sheet of the paper. Proceed in this manner until the measure is completed.

g. When you have actually completed measure up the distance, move the document to the graphic range to determine the soil distance. The only tick point out you will certainly be measuring the distance in between are tick marks (a) and (b). The mite marks in in between are no used.

h. There might be times when the distance you measure on the leaf of the document exceeds the graphic scale. In this case, there are different techniques you can use to determine the distance.

(1) One an approach is come align the right tick note (b) v a printed number in the main scale, in this case the 5. You have the right to see that from point (a) to allude (b) is more than 6,000 meters as soon as you include the 1,000 meter in the extension scale. To recognize the precise distance come the nearest 10 meters, location a tick mark (c) ~ above the edge of the record at the finish of the expansion scale. You recognize that from allude (b) to suggest (c) is 6,000 meters. V the tick note (c) placed on the sheet of the record at the finish of the extension scale, on slide the record to the right. Psychic the street in the expansion is always read from best to left. Align tick note (c) through zero and also then measure up the distance in between tick marks (a) and (c). The distance in between tick point out (a) and also (c) is 420 meters. The full ground distance between start and finish clues is 6,420 meters.


Determining the exact distance.

(2) Another technique that might be offered to determine specific distance between two points when the edge of the document exceeds the bar scale is to on slide the edge of the paper to the appropriate until tick mark (a) is aligned with the sheet of the extension scale. Make a tick mark on the paper, in line with the 2,000-meter mark (c). Then slide the edge of the paper to the left till tick note (b) is aligned with the zero. Estimate the 100-meter increments into 10-meter increments to recognize how many meters tick mark (c) is indigenous the zero line. The complete distance would be 3,030 meters.


Reading the expansion scale.

(3) At times you might want to understand the distance from a suggest on the map come a allude off the map. In stimulate to carry out this, measure up the distance from the start allude to the leaf of the map. The marginal notes provide the road distance indigenous the sheet of the map to part towns, highways, or junctions turn off the map. To determine the complete distance, include the distance measured ~ above the map come the distance provided in the marginal notes. Be sure the unit of measure is the same.

(4) as soon as measuring street in statute or nautical miles, ring it turn off to the nearest one-tenth the a mile and also make certain the ideal bar scale is used.

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(5) distance measured top top a map does not take into consideration the rise and also fall the the land. All ranges measured by making use of the map and graphic scale are flat distances. Therefore, the street measured on a map will increase when in reality measured on the ground. This have to be taken into factor to consider when navigating throughout country.