i've just download the app for fun....and it's not spam, etc, but just have a look, only from the iphone, with mike's extension....must be really cool app....
you can download maps free and seems can work "offline".... no way, mercedes rules
just look from the iphone itself what you can do...

i've been to fast...not all fonction available, if no device behind, but there is free maps to downloads, sure...