1. An image viewing system comprising: a source of images; a computer having a processor and a user interface module, the user interface module configured to generate a graphical user interface, the graphical user interface having a first window in which at least one image from the source images is displayed; and a screen connected to the computer and configured to display the graphical user interface; wherein, in response to at least one user input, the graphical user interface is configured to generate an image-navigation map and to display the image-navigation map in a foreground of the first window and the at least one image from the source of images in a background of the first window, the image-navigation map including one or more thumbnail images of at least one of the images from the source of images.