title: How to get meters in pixel in mapkit?
body: <p>I wanted to test the mapKit and wanted to make my own overlay to display the accuracy of my position.
  If i have a zoom factor of for example .005 which radius does my circle around me has to have(If my accuracy is for example 500m)?</p>
  
  <p>Would be great to get some help :)</p>
  
  <p>Thanks a lot.</p>