What is the point of the Google Maps Navigation app? Is there something that I'm not seeing that can't be done by going into your phone book and getting directions from there?
The directions you're getting
are from Google Maps Navigation. Clicking on a contact's address launches Google Maps Nav unless you have changed your defaults.
He's talking about how the app list has "Navigation" as a separate link to the navigation app. He doesn't know if it does anything different than just finding the address in contacts and navigating from there.
Personally, I like having everything within reach, and it filters out contacts that don't have addresses. Plus, it's the only way you can get to 3D map view with traffic without having a set destination.