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Land Nav Task 2 - Identify Topographic Symbols on a Military Map

Standards: Identified topographic symbols, colors, and marginal information on a military map with 100 percent accuracy.

Conditions: Given a standard 1:50,000-scale military map.

Standards: Identified topographic symbols, colors, and marginal information on a military map with 100 percent accuracy.

 

Performance Steps

1.   Identify the colors on a military map.

a. The ideal situation would be that every feature on that portion of the earth being mapped is shown on the map in its true shape and size. Unfortunately, that is impossible.

b. The amount of detail shown on a map increases or decreases, depending on its scale; for example, a map with a scale of 1:250,000.

c.  Details are shown by topographic symbols. These symbols are shown using six basic colors as shown in table C-1.

Table C-1. Colors on a topographic map

Colors

Symbols

Black

Cultural (man-made) features other than roads

Blue

Water

Brown

All relief features-contour lines on old maps-cultivated land on red-light readable maps

Green

Vegetation

Red

Major roads, built-up areas, special features on old maps

Red-Brown

All relief features and main roads on red-light readable maps

2.   Identify the symbols used on a military map to represent physical features, such as physical surroundings or objects, as shown in table C-2.

Table C-2. Features on topographic maps


a. The shape of an object on the map usually tells what it is, for example, a black, solid square is a building or a house; a round or irregular blue item is a lake or pond.

b. Logic and what the colors mean must work together in determining a map feature. For example, blue represents water. If you see a symbol that is blue and has clumps of grass, this would be a swamp.

c.  The size of the symbol shows the approximate size of an object. Most symbols are enlarged 6 to 10 times so that you can see them under dim light.

d. Use the legend; it has most of the symbols used on the map.

3.   Identify the marginal information found on the legend.

a. Marginal information at the top of the map sheet.

(1)  The top left corner contains the geographic location of the map area and the scale of the map.

(2)  The top center has the name of the map sheet.

(3)  The top right corner contains the map edition, map series, and the map sheet number.

b. Marginal information at the bottom of the map sheet.

(1)  The lower left corner of the map contains the legend, the name of the agency that prepared the map, the map sheet number, and the map sheet name.

(2)  The bottom center contains the bar scales in meters, yards, miles, and nautical miles; the contour interval of the contour lines; the grid reference box; the declination diagram; and the G-M angle (mils or degrees).

(3)  The lower right corner contains the elevation guide, the adjoining map sheet diagram, and the boundaries box, which shows any boundaries that may be on the map.

Evaluation Preparation: 

Setup: On a 1:50,000-scale military map, circle each item of marginal information found on the map. Randomly letter the circled items A through J. Circle an item or feature shown on the map by color. Randomly number each colored item 1 through 10. The items are listed in the Evaluation Guide/Performance Measures. Have a sheet of paper and two pencils available for the soldier being tested. For each soldier tested, provide a duplicate set of the map, paper, and pencils.

Brief Soldier: Tell the soldier to letter the paper A through J and 1 through 10. Tell the soldier to write down the name of the item contained in each lettered and numbered circle on the map.

Performance Measures

GO

NO GO

1.   Identified the sheet name.

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2.   Identified the sheet number.

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3.   Identified the contour interval.

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4.   Identified the G-M angle (mils or degrees).

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5.   Identified the legend.

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6.   Identified the bar scales.

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7.   Identified the declination diagram.

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8.   Identified the grid reference box.

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9.   Identified the adjoining map sheets diagram.

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10. Identified the elevation guide.

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11. Identified 2 of 2 specific man-made features (shown in black on the map).

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12. Identified 2 of 2 water features (blue on the map).

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13. Identified 2 of 2 vegetation features (green on the map).

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14. Identified 2 of 2 man-made features; for example, main roads or build-up areas (shown in brown or red-brown on the map).

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15. Identified 2 of 2 contour lines (shown in brown or red-brown on the map).

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Evaluation Guidance:  Score the soldier GO if all performance measures are passed. Score the soldier NO GO if any performance measure is failed. If the soldier scores NO GO, show the soldier what was done wrong and how to do it correctly.

References

 

Required

Related

 

FM 3-25.26

 

 

FM 21-31