I still didnt found solution to my previous problem, so as a workaround, temporary fix to get going i decided to put latitude and longitude in text boxes and then via $watch or ng-change i will use data in controller, but neither $watch nor ng-change works with this script, i wasnt sure about my code so i duplicated demo plunker and tried with that script and found that it didnt work with demo as well so i believe that ng-change doesnt work with this plugin.
My demo : http://plnkr.co/edit/FvdAzKBTRmVeSNI7qpG8?p=preview