Well, that sucks. They got too big for their britches. I can still download more than 3, must have kept my memory intact or grandfathered in.
Just looked and I have 10 maps downloaded on my iPad.
I don't think there is ONE that is the best, so I use a few. They are cheap enough, think of a price of a couple of beers at a bar. So I use 3 apps plus paper maps as backup (iPad can overheat or crapout). My cab setup has the iPad mounted just above the radio level, easy to access. Here is...