title: Are tile overlays possible with the iPhone's MapKit
body: <p>I already have a tile source set up for use with the Google Maps JavaScript API.  I am trying to translate this for use with the iPhone MapKit.  I have correctly implemented the javascript zooming levels into mapkit.  Whenever <code>- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated</code> is called, I snap the region to the nearest zoom level based on the same center point.</p>
  
  <p>Is it possible to implement a solution possibly with CATiledLayer to implement a tiling solution.  Does the iPhone use the standard 256x256 tiles like google maps does natively?  Any direction or help on this would be greatly appreciated.  I would rather not waste a couple weeks trying to implement this if it's not possible.</p>