Actually what you want is reverse geocoding, converting GPS coords, to a landmark object. On the BB you can only geocode, using the LBS api to build up an Address and obtain GPS coords from the resulting Landmark object. However you could use googles api or other 3rd parties to achieve this.. and I guess it can be done seemlessly from within your app, via a http connection to build up the request, then read the resulting address returned via a data input stream.