Maps on my phone are crucial to me. The single most important feature is offline use - I often sit on the Underground (no Internet) going in the general directi

Maps on my phone are crucial to me. The single most important feature is offline use - I often sit on the Underground (no Internet) going in the general direction of my meeting, but needing to know if/where I need to change lines, and then how to get from the tube station to the meeting location. So while this looks like it will fill a gap on iOS, it's something I'm unwilling to wait for.