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answers:

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if i wanted to implement something like a carfinder, is it posible that on the mkmapview i can get routing-information ? maybe the line, we know from google-maps or any information in an csv (or sth like that) that tells some waypoint-information ?

A: 

Here's a blog post about drawing polylines as MKMapAnnotations, with sample code: http://spitzkoff.com/craig/?p=108.

Seamus Campbell
Also have a look at the link in this post: http://stackoverflow.com/questions/1974056/routing-polylines-in-iphone-google-maps
Seamus Campbell