how do you land a plane in low visibility conditions?
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There’s a system called Instrument Landing System (ILS), which consists of two antennas transmitting, one that tells the plane if it’s left or right of the runway (called the localizer antenna), and one that tells the plane if it’s above or below the glide slope (glide slope antenna) (how high it is supposed to be for any distance from the runway)
The planes autopilot can use these antenna signals (and a bunch of other sensors, like an altitude measuring laser) to fly the plane all the way to the runway and even land it, this would be called a Category III autoland.
For safety reasons, there still has to be **some** visibility, for a CAT III autoland the minimum altitude is generally 100m, that means at 100m above the ground the pilot has to be able to see the runway to be allowed to continue the landing. If they don’t, then the plane has to go around and try again
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