For example, a mile before a left turn it'll tell me to bear left instead of the way google suddenly springs it on me half a mile before a turn on a super busy road during a traffic jam.

Instead of having to glance at my phone every little bit it displays the directions on my heads up display along with the lanes that I should be on to make the turn. It also knows how to deal with music already playing on the car speakers by muting the driver side of the music while reading directions so my passengers can keep listening.

Along with all of this, even though it's quite fiddly to view it, if I connect my phone to the car and have internet on it can grab traffic data to overlay onto the map, so I get the best of both worlds. <3 Mazda

Another thing I've noticed is take anything fast, implement it in software, and latency becomes a killer. Software is so terrifyingly slow compared to hardware. Its hard to believe that people who write disgustingly slow UIs are in the same industry as people who write anti-lock brake code or real time fuel injection code.

    > I'm using google maps on my phone anyway due to the
    > better interface and constant updates.

Rather than relying on it for guidance, I use it as a reference for routing around small inconveniences (road work/construction, accidents, etc.) on familiar routes. I've found it quite useful in this regard, and the large screen size definitely comes in handy for at-a-glance usage.