Definition
A condition in which the pilot's ability to see distant objects, terrain, or the horizon is reduced by atmospheric phenomena such as haze, fog, mist, smoke, dust, precipitation, or low clouds. Restricted visibility limits the use of outside visual references for navigation and aircraft control.
Plain English
It means you can't see as far as you normally would because something in the air — like fog, haze, or rain — is in the way.
Context Anchor
Used in visual navigation and orientation discussions, especially when a pilot may be relying on outside landmarks to stay on course.
Derivation
Restricted comes from the Latin restringere, meaning 'to draw back' or 'limit.' Visibility comes from the Latin visibilis, 'able to be seen.' Together: how far you are able to see is being held back or limited.
Why Pilots Care
Limits the pilot's ability to navigate by visual references, maintain VFR, and avoid terrain or obstacles.
Grounding Statement
Picture flying toward a familiar town in haze: the town is still there, but you may not see it early enough to use it as a reliable landmark.
Intuition Check
Restricted visibility does not mean the pilot is completely unable to see. It means the pilot’s view is limited enough that normal visual navigation or lookout may be less reliable.
Example Sentence 1
The pilot delayed departure after the morning fog created restricted visibility across the airfield.
Example Sentence 2
With restricted visibility reported along the route, the flight relied on radio navigation aids instead of pilotage.