1.LAYERS CAN BE SWITCHED ON / OFF.
2.ACTUAL IMAGE CONSTANTLY DISPLAYED.
3.EG, BY SWITCHING OFF THE ROADS LAYER, COLOURED LINES INDICATING THE ROADS WILL NO LONGER BE DISPLAYED. HOWEVER, ROADS WILL REMAIN VISIBLE ON THE IMAGE.
4.SWITCHING OFF THE AIRPORTS LAYER WILL NOT DISPLAY THE NAMES OF AIRPORTS. HOWEVER, AIRPORTS WILL STILL BE SEEN.
5.LAYERS PROVIDE A THEMATIC VIEW TO A NORMAL USER.
6.LAYERS CANNOT BE ADDED OR DELETED.
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