Do all calculations in terms of the visible map rect instead of converting CGRect grid pieces to MKMapRects.
Do all calculations in terms of the visible map rect instead of
converting CGRect grid pieces to MKMapRects.

wonknu/kingpin,ppamorim/kingpin,lydonchandra/kingpin,foursquare/kingpin,terhechte/kingpin,shawhu/kingpin,lydonchandra/kingpin,denivip/kingpin,ppamorim/kingpin,wonknu/kingpin,stanislaw/kingpin,foursquare/kingpin,stanislaw/kingpin,itsbonczek/kingpin,stanislaw/kingpin,denivip/kingpin,wonknu/kingpin,stanislaw/kingpin,lydonchandra/kingpin,foursquare/kingpin,itsbonczek/kingpin,ppamorim/kingpin,denivip/kingpin,shawhu/kingpin,itsbonczek/kingpin,shawhu/kingpin