A navigation trick that is very useful for retouching are the keystrokes that move you through the image one panel at a time. The panels do not overlap. The Home key moves the image to the top left corner and the End key moves to the bottom right corner. This works if the image is larger than the screen.
Retouching is best done at 100% or greater, so this helps you manage the image so you don't miss anything. The Page Down and Page Up keys move the image one panel up or down. Adding the
With these keystrokes you can move through an image one panel at a time to check for need retouching, especially useful for spotting in copy and restoration work or simple looking for distractions.