(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.

The estimation is incorrect though. It either freezes completely, or it jumps back or forward, to what it's position *would* be if it was working to timetable. If you watch what the X1 tends to do between Bowburn and Durham you'll see what I mean. I think the grey icons are just buses that aren't tracked altogether, so again, just follows what the position would be according to timetable.

Edit: Have a quick look at the two X1s on the A177 at Bowburn now.