how to resize the zoom level at mapping

  let spanX = 0.007
  let spanY = 0.007
  var newRegion = MKCoordinateRegion(center: theMap.userLocation.coordinate, span: MKCoordinateSpanMake(spanX, spanY))
   theMap.setRegion(newRegion, animated: true)

change the value of span.

other tracking system is here

http://www.johnmullins.co/blog/2014/08/14/location-tracker-with-maps/