I know that in the google maps API it’s possible to replace the existing tiles with my own – and using their tile server – feed my own maps.
i’m interested in doing this using monotouch – is there any way of doing this atm – or does anyone know of a way of achieving this any other way?
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If you use an UIWebView (or whatever its called) you can host an html page. See phonegap for an implementation of this approach (although not a MonoTouch implemenation, which may be for the best thanks to 3.1.3)
Theres an example of google maps js api being used with custom tiles here http://mapwow.com/