Personally, I like using my cell phone in unfamiliar areas for GPS. I set up my destination while sitting in the airport parking lot. (not the garage, where GPS doesn't work.) Then I put it on audio, and let it voice guide me while I watch traffic and read the damn signs. The latter is particularly important... no amount of "instant update" is going to be good enough to know that some road is closed right now due to a pipe break that just took place.
And, I am watching where I am going, and getting familiar with where I am... oh yeah, and most importantly, watching traffic.
No, this isn't perfect... but I can always pull over and reset the whole darn thing.
Funny thing, not more than 5 weeks ago I was driving a Ford Mustang... darn thing wanted to install software while I was driving. Uh, not the time Ford. Had something to do with their SYNC system. I happened to know that particular highway route, and managed to just turn off my phone until later.