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The M 21 can refer to many things. If you mean the Manhattan Bus Map 21, you can find this at "Manhattan Transit Authority". The Nevada Bureau of mines has a map M 21. If you are referring to "Dragon Age: Origins", M 21 Ostaga, a website called Game Pressure would be the right place for you.
Different kinds of maps are created for different purposes. To navigate from one place to another, one would prefer a physical (geographic) map, but to locate a country, one would need a political map and a world map is for the world. Further refinements include road maps, topographic maps, nautical and aeronautical charts, each of which represent more physical details. Thematic maps can be used to display distribution of various measurements, such as people, oil, cellphone coverage, etc.
Maps have legends. A map legend is an explanation of the symbols on the map. If one cannot find the legend on a map, one is unlikely to find anything else on it.
Everyone who wants to get from one place to another and feels a map is the best way to find the route to travel. GPS have their place, but, a paper map is often the better way to find a route to travel. GPS is limited, and does have limitations. GPS and papers maps together is sometimes the better way to plot a direction. Not everyone has a GPS device.
There are many places where one can find an ordnance survey map. One looking to find an ordnance survey map should visit the official Ordnance Survey website and click the 'Get a Map' link.
The height at one place is called elevation. Elevation refers to the vertical distance of a location above sea level.
The measurement from one place to another is the distance.
Height lines on a map are called contour lines. These lines connect points of equal elevation, helping to represent the terrain's shape and steepness. By analyzing contour lines, one can determine the elevation changes and the landscape's features, such as hills and valleys.
A map that shows directions or routes to travel from one place to another is called a navigation map or a route map. It typically includes information such as roads, highways, landmarks, and distances to help guide travelers to their destination.
spot height
A protractor, and the legend of the map.
answers.com fails epically
latitude or longitude...
A road map is a type of map that shows roads and highways to help travelers navigate from one place to another. It includes information on distance, direction, and landmarks along the route. Users can follow the roads indicated on the map to reach their destination.
A generalized map represents and allows one to handle subdivided objects. This definition applies to mathematics an refers to a topological model.
Often it's called an "inset".
The change in the elevation between isolines is called a contour line. Contour lines on a topographical map resemble a volcano.