so we can live
You need a compass rose so you know which direction the map is. Without knowing the direction of the map you will be going in the wrong direction.
So you know what distance equals a mile which varies map to map.
why is a scale important
Map tracking is important foe military so the military involved can be aware of their respective surrounding's.
The map key is different on any map; It helps you understand how to read the map. Sometimes there are symbols you do not understand, so the key describes what they mean.
It is important to know how to make and use maps when the GPS coordinates are used to make those maps. Otherwise, maps are sometimes useful as backgrounds on GPS receivers so you can see where you are, but that is not mandatory in all cases.
as in a town map there will be direction .So according to a preson's desire to any direction he can get to know the direction in the map as it will be there on map so he or she do not need to sit and find it pouring out sweat.
Depending on what the map is of scale is very important. On a road map of a region you might read 1 inch equals 1 mile, this is so that the map can fit on the paper or computer monitor, actual size is not an option. On a Map of the world the scale might be 1 inch to 1000 miles. Or if if something is drawn to scale it means, that you have one part of the map in feet and the other side in meters.
weather map is so important for us.with the help of weather map we can determine the average temperature and mean rainfall,climatic condition,movement of wind and the vegetation of a particular region
So you can read books and learn
The Stonehenge my friend was an Observatory that was said to be used to map stars, or so I have read.
So you'll know what tools to use when instructed to do so.