M-indicator is not navigation app like Google Maps. It just gives information about transport services in Mumbai. Information like bus timings, local train timings, movie show timings etc. This app is available in all platforms Java, Android, Blackberry, iOS, and Windows Phone. These apps have several services like Mumbai local train timetable, bus routes, auto/taxi fare, classifieds and picnic spots. So overall you will get information related to Mumbai.
From user comments in Windows Phone store this app is not up to date. If you are from Mumbai you can make use of this app.