DEFINITION AND PURPOSE - correct answer A map is defined as a graphic representation of a portion of the Earth's surface drawn to scale, as seen from
... [Show More] above. It uses colors, symbols, and labels to represent features found on the ground.
The ideal representation would be realized if every feature of the area being mapped could be shown in true shape.
The purpose of a map is to provide information on the existence, location, and distance between ground features, such as populated places and routes of travel and communication. It also indicates variations in terrain, heights of natural features, and the extent of vegetation cover.
All operations conducted require maps; however, the finest maps available are worthless unless the map user knows how to read them.
MARGINAL INFORMATION - correct answer A map is considered equipment. To use it properly, you should read the instructions.
These instructions on the outer edges of the map are called marginal information.
All maps are different so examine the marginal information on each map carefully.
MARGINAL INFORMATION TOP MARGIN - correct answer The top margin of the map helps you to identify the specific area covered as well as the age and scale of the map
Sheet Name - correct answer The sheet name is found in bold print at the center of the top and in the lower left area of the map margin. A map is generally named for the settlement contained within the area covered by the sheet or for the largest natural feature located within the area at the time the map was drawn.
Sheet Number - correct answer The sheet number is bolded in the upper right and lower left areas of the margin and in the center box of the adjoining sheets diagram, which is found in the lower right margin.
It is used as a reference number to link specific maps to overlays, operations orders, and plans.
For maps at 1:100,000 scale and larger, sheet numbers are based on an arbitrary system that makes possible the ready orientation of maps at scales of 1:100,000, 1:50,000, and 1:25,000
Series Name - correct answer The map series name is found in the same bold print as the sheet number in the upper left corner of the margin.
The name given to the series is generally that of a major political subdivision, such as a state within the United States or a European nation.
A map series usually includes a group of similar maps at the same scale and on the same sheet lines or format designed to cover a particular geographic area.
It may also be a group of maps that serve a common purpose, such as the military city maps.
Scale - correct answer The scale is found both in the upper left margin after the series name and in the center of the lower margin.
The scale note is a representative fraction that gives the ratio of a map distance to the corresponding distance on the Earth's surface.
For example, the scale note 1:50,000 indicates that one unit of measure on the map equals 50,000 units of the same measure on the ground.
Series Number - correct answer The series number is found in both the upper right margin and the lower left margin. It is a sequence reference expressed either as a four-digit numeral (1125) or as a letter, followed by a three- or four-digit numeral (M661; T7110)
Edition Number - correct answer The edition number is found bolded in the upper right area of the top margin and the lower left area of the bottom margin.
Editions are numbered consecutively; therefore, if you have more than one edition, the highest numbered sheet is the most recent.
This date is important when determining how accurately the map data might be expected to match what you will encounter on the ground
MARGINAL INFORMATION: BOTTOM MARGIN - correct answer This portion of the map includes [Show Less]