XMP sidecar files

Geotag now supports XMP sidecar files. These are files containing metadata for your images. They have the same name as the image file, only with a .xmp suffix. The advantage of these files is, that you don't have to modify the original image file.
Here is how Geotag deals with XMP sidecar files:

When finding location data

Geotag first scans the original image file to see if it contains location data.
Then, if an XMP sidecar file exists, it scans that file as well.
Location data from the sidecar files has precedence over that found in the original image.

When writing location data

If an XMP sidecar file exists, the location data will be stored in that file.
If no XMP file exists, Geotag will by default write the location data to the original image.
There is however a check box labeled 'Always write to XMP files' to be found at 'File->Settings'.
If you select this check box, Geotag will always write the location data to an XMP sidecar file and create one if it doesn't exist yet.