They probably have a nicely decoupled code and not too complex an integration. If you're just showing some icons on the map, all you need to know is where to pl

They probably have a nicely decoupled code and not too complex an integration. If you're just showing some icons on the map, all you need to know is where to place them on the overlay layer and then query and set the bounding box for the map. That's pretty much it. The rest can be in your own code.