Palmpilot said:
I take the term "visible horizon" literally. Making up one's own definitions of terms tends to lead to misunderstandings.
OK, sorry if I don't understand, but can you explain a bit more by what you mean by a literal meaning of "visible horizon"? I tried to find a definition of this in aviation sources like the PHAK or AFH, but it wasn't defined there.
Do you mean one has to be able to see the actual horizon? And if so, how much of it? I have been in situations where I could infer where the horizon was from perhaps 20% of it being directly in view, but maybe that isn't what you mean by a literal meaning?
I am happy to try and understand people's posts in terms of any reasonable definition they like to use. I think this question arose because I wrote "I guess I don’t know the exact regulatory language, but doesn’t VFR flight require having a visual horizon, at least to do so safely?"
I see know now that VFR flight per se, that is, per regulation, does not actually require a view of the horizon, so long as visibility and cloud clearance requirements are met, as you have noted.
I think it is also true that one could not safely fly "visually" without instruments unless one has some reference to the horizon, whether that reference be a direct view of it or indirect cues (which can be misleading).