JROTC map reading questions and answers

What is a map? a portion of earths surface as seen from above and drawn to scale How do you read coordinates on a map? right and up What is a scale on the map? Shows the relationship between map distance and ground distance What are the 7 types of major terrain features? Hill, valley, depression, ridge, saddle, spur, and draw What is the color blue on a map? Water such as lakes, rivers, and swamps What is the color black on a map? Man-made objects such as buildings, roads, and railroads What is the color green on a map? vegetation What is the color red on a map? Major roads, highways, and populated areas What is the color brown on a map? Elevation and relief depicted with contour lines What are contour lines? Brown lines on a map that show elevation and relief What are three types of contour lines on a map? intermediate, index and supplementary what are the three types of North? true north, grid north and magnetic north How is Grid north depicted on a map? letters GN How is True north depicted on a map? a star How is Magnetic north depicted on a map? half arrowhead What is a G-M angle? The angle between Grid North and Magnetic North What is a declination diagram on a map? Shows the angular relationship between true, grid and magnetic north What is an azimuth? A horizontal angle measured clockwise from north How do you compute a back azimuth? Add or subtract 180 degrees How many degrees in a circle? 360 degrees What are the units used to measure distance on a map? Miles, meters, and yards What is the formula for determining actual ground distance on a map when bar scales are not available? Map Distance x