A compass rose shows the orientation of a map on Earth. Geographers use a compass rose or the north arrow when drawing their own maps. An explanatory list of the symbols appearing on a chart or map is a legend. Sometimes, this is called a key because it is key to understanding what a map is saying. Back Scale Scale is an indication of the relationship between the distances on a map, chart, or plan and the corresponding actual distances.
Scale can also mean the size of an area being studied.
Relationships observed at one scale may not be true at another scale. Back Grid System A grid system is a network of horizontal and vertical lines used to locate points on a map or a chart by means of coordinates. The grid system often used on state highway maps consists of columns and rows labeled with letters and numbers. Latitude and longitude also form divisions in a grid system. Back Economic Systems Economic systems are organized sets of procedures used within communities or between communities to govern the production and distribution of goods and services.