First you will need a FITS image with WSC astrometry (1). For this example, I took a SDSS image and changed the FITS header to shift it by 0.05 degrees. You can get that broken image here, or the corrrect image here
Point your browser to http://iraf-nvo.noao.edu/wcsfixer
Use the Browse button (2) to locate your image, and click on "Submit".
Watch the dark blue Status line (3) as the computation happens.
When finished, you can see various views of the changes that were made, the displacements of stars, the original and fixed WCS.
Finally, you can download the fixed image (4).
