I have finished a program that will turn a set of geotagged photos into a .gpx trace. This program is pictogpx and can be found on github.

The usage is fairly simple, just give it the name of the .gpx file to create and a list of images.

I use it to interpolate between geotagged images so I don’t need to manually tag each one. It could also be used to see how you travelled from a set of photos.