I like to place game cameras on my property to watch the wildlife. I have created a map with Google Maps which shows all my trails. Then I took a photo/screenshot of the map and placed an X on the spots where my cameras are located. HOWEVER, when I go to move a camera to a new location I am unable to modify the first screenshot/photo of the map. I am looking for a way to use one screenshot/photo of a map and go back to it again and again and be able to move my X spots where cameras are when I move them. So, is there an app or existing way to put marks on a photo and then go back days or months later, erase the mark, and place a new one on a different spot on the photo????? Thanks.