For an instance now you are standing in a particular mall, just by zooming in to that mall you can find necessary shops in different floors. No need to roam here and there or enquiring with others. Even in departmental stores just by using indoor map to find children section, cosmetic center whatever we want.
Google states that more than 40 venues had supported, and many of them are like Railway stations, malls and museums. Even the building owners can upload their floor plans in Google map for future inclusion. You can also a check a full list of supported locations on Google’s website.
In normal Google map you can see the streets, Railway station, art galleries and malls. Now just zoom in to the Railway station the indoor maps will “magically” appear, where you can easily find where the coffee shops, books shop restroom etc. are situated.
At present Google Indoor maps are available only in selected location like United States, United Kingdom, Canada, Switzerland, and Japan.
Hope shortly it will come to India.