How do pilots land in fog?

skypilot024

Pilots usually don't land in fog; autopilots do. The pilots will program the flight management computers with the proper info for the landing runway and the flight management computers will direct the autopilots to carry out the approach, and sometimes the landing and rollout as well. The aircraft and aircrew must be properly certified to perform these approaches. Source---personal experience. Apr 07 12, 6:15 PM

sportsherald

To support the above answer, this is known as an Instrument Landing System (ILS): "ILS stands for Instrument Landing System and simply stated is what pilots use to safely guide their aircraft to the runway when the weather conditions do not allow for a visual approach and landing. Such conditions make it very difficult or even impossible to see ahead, so using radio signals (sometimes coupled with high-intensity lights) the pilot can safely navigate the aircraft through low ceilings, rain, dense fog, snow, and safely land. The radio signals are ground-based and are sent continuously. Containing two separate parts, the signals guide the pilot (or autopilot) both to the centerline of the runway and down a safe rate of descent, or glideslope." -from http://www.ilsapproach.com/ Apr 07 12, 6:19 PM