The Navigation Panel is a nice way when one needs to crop images or when you make selections for any purpose.
I found it a bit confusing that the red crosshair alwas points exactly in the middle of a pixel, not on the boundaries of the pixel. When cropping or selecting the most important thing is to know which pixels are inside the selection and which ones are outside. So I always wonder if that pixel is in or out.
Instead of the current display (left side) I would suggest to make it like this (right side):
Navigation Panel changes
Navigation Panel changes
In the second image the crosshair aligns to the edges of a pixel. Additionally, the crosshair isn't dotted but solid and the grid isn't black but silver (both for better visibility). Should be a lot easier to select or crop this way.
What do you think?
Edit: I forgot to turn some black grid-pixels from black to silver in the altered image but I guess you get the idea. 
