Porschemann
Member
Maybe this has already be presented, but just in case, here it is:
My Mavic 2Z has a body roughly 0.25 ft wide. This is the most visible part when flying away or toward the pilot. Now the accepted angular resolution of the human eye is about 1/60 degree or 0.000291 radian.
Calculations:
Distance X Angle (in radians) = Arc length
Distance X 0.000921 = 0.25 ft whence distance = 859 ft or 0.16 mile.
Now even if we up the angular resolution of your eye by a factor of 4, we get about .064 mile straight line.
Note: if the drone is at h=300 ft, the horizontal distance is 804 ft.
I challenge anyone to let someone fly your drone out somewhere randomly to a distance of, say 0.64 mile, while you keep your back turned and then you turn around and see the drone.
Who flies their Mavic 2 drone no farther than 1000 feet? As for myself, I have trouble seeing it four or five hundred feet away.
Line of sight has nothing to do with being able to actually see the object. The definition of line of sight is a clear unobstructed line between two points.
So if your drone is hovering only 20 feet away but on the other side of a tree or building, that it is not direct line of sight. If your drone is a thousand feet away from you in a clear field with nothing between you and the drone, you have direct line of sight even though you may not be able to clearly see it unaided.