Locations are the heart of the aMapApp3 object.  It's purpose in life is to allow users to designate locations on a map and then used the location display to attach and view a variety of files.

Once a location marker has been added to the map, it is possible to drag the marker to another location.  It is often useful to roughly locate the marker on a large view and then zoom in on the map to move the marker to a precise location.