Previews of the photos

Thank you for this very useful app.
If I could ask for one thing to be added - or maybe it's already in the app and I haven't found it yet.
I would like to see previews of the photos I've opened with the app. 
And I would like to be able to move around in those previews with arrows, with the position displayed on the map.
Right now, it's very difficult to navigate blindly.
Thank you very much.
