I don't get the comparison. I use Navigon on my iPhone. I travel extensively. It's been 99.9 percent perfect. As good if not better than stand alone GPS devices. I understand how it's nice to have it built into Android, not having to pay for a separate app, but turn by turn directions either work or don't work. And I use them every day.
I'll be more than happy when Apple builds it in, but until then, I've more than happy, and it's certainly not enough to make me look at switching to Android, even if it never happened.
Probably as often as the data provider(s) that Google is feeding into their system as well. You didn't think that Google was actually collecting that info directly, did you?
I believe he answered your question as well as could be done without some inside knowledge. We don't know how often anyone's db is updated, so with no benchmark how can a fair comparison be made?
I have no idea. When I start having problems with finding businesses, or if it takes me to closed businesses, I'll worry about it. So far, in over 2 years using the app, I've not had problems.
I'll be more than happy when Apple builds it in, but until then, I've more than happy, and it's certainly not enough to make me look at switching to Android, even if it never happened.