(26 Jul 2014, 9:35 am)tyresmoke wrote The Arriva map can do this, indeed I've just been looking at mine and the buses that are not being tracked (for whatever reason) are displaying an estimated location with a grey icon instead of green.

I have the setting disabled to only show live buses, and find that aureolin is right - they often don't re-appear as grey - and have found that once you exit the application and go back on it, it does pick up these buses with grey icons.