Even if google maps is right, it isn't helpful to how people ride transit. Do you want to ride the 4 or 9 or 99? It doesn't matter, all of them go to where I'm going, but I have to choose when really I should just go to the stop and catch the first bus. This is a real situation for me where I selected the 4, but it turns out that it went by half a block before I reached the stop, and google maps got mad when I got on the 9 even though they both go exactly the same place (by a somewhat different route in between that didn't matter)

I haven't found city specific transit apps any more helpful, but I don't have much experience with them. google maps sucks is terrible for the job though.