[8ytecoder]

Always. Here maps is a good backup solution. It allows you to download pretty much the entire world - if you have the space in your phone.

[savoytruffle]

I always use Apple Maps, but once in a while if I'm in an unfamiliar city and the Apple Maps directions seem suspiciously weird, it is useful to have Google Maps app for a sanity check. (directions to a particular pier at the Seattle waterfront were insanely incorrect via Apple)