Answers

2015-08-13T17:27:33+05:30
With the help of symbols observer can easily make out what is there in that place because if we will write everything in map the map will not be clear.
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2015-08-13T18:30:40+05:30
The need of symbols in preparation of maps bcoz map is a sheet of paper and it is not very long therefore all the details are not coclude in them by writing.So symbols are used to tell which type of place it is and it proves also very helpful.
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