Our vis minimum is 1/2 Statute Mile..... and of course the problem is defining visibility from the Cockpit.....the weather (which determines visibility) is measured at ground level in a horizontal plane).... which is an altogether different perspective than the slant angle view we get while airborne.
How many of us actually measure by some means the actual distance we can see ahead?
Just how does one do that in a practical manner?
Is it fair to say....what we do is go by our personal comfort level to a great degree as we do not have a handy way of measuring distance using the Mark I Eyeball?
Also....Fog is a surface based weather phenomenon by definition thus is not "Cloud" which is not surface based weather.
When you operate at the very edge of the legal limit....the margin for error is very small.
All I was asking JimL was what his definition of "Scud Running" is.... as compared to flight within the legal limits.
Is there a minimum height we must fly in Uncontrolled Airspace (remembering the FAA does not specify a certain distance from persons and property on the ground as does the CAA)?
Was the Blackhawk Crew flying illegally on this cross country flight if they complied with the FAR's re Vis and Clear of Cloud right up until the final moments of the flight (assuming a deterioration in Vis or "ceiling" occurred that forced them to decide to land)?