I landed in CLT that night about 1245am. The fog was some of the worst I have ever seen. I was in a MD88 and we set up and briefed for the CAT3 and did the autoland. I do have another issue regarding the fog. CLT has no SMGS. No problem there. The problem comes once you enter the ramp!!! It is virtually impossible to tell where you are and which way you need to go to get to the gate. The ramp controllers are no help due to the fact they cannot see you. It was a little freaky cause using the taxi lights made it worse due to the heavy fog, and turning them off, well you know!!