load own map based on location on iphone4

i want to load my own map based on current location , lets say 开发者_如何学编程i have all the images based on zoom level like zoom=16 (then all images of 16) , zoom=14(all images of 14 levl)

But how to load these maps based on location , i mean how to get notified so that i can load images???

---

I believe this might be exactly what you need: Route Me, an iOS map library for performing the standard UIMapView types of things with your own maps.