This app was mentioned in 4 comments, with an average of 13.75 upvotes
Or better yet, TripView is an excellent public transport app, especially useful for buses you catch regularly. Includes the real time tracking and GPS maps in one.
Here's a link to the app (there's also a free version) for anyone with an Android device.
go to play store and you will find 1000s of apps doing that. Why having high quality app in cheap price with a very long term support seems to be horrible to you. For example, look at https://play.google.com/store/apps/details?id=com.grofsoft.tripview&hl=en&gl=US it is a $3.5 software which you will be using for the rest of your life.
Sydney has TripView, the most handy travel app I have ever had, real-time gps updates on public transport services.