That's exactly what I said.
This is exactly what you said:
Nitpick: Cardinal altitude is not mandatory below 3000' AGL. Doesn't apply. You guys have to assign them, but we don't have to fly them if not assigned. In this case, no assignment so not required.
By which reg? I don't see it, but I am not arguing that it's not there.
91.179(b)
It's a chicken and egg problem. If it's not charted or in the database, how would someone know it's there? If a tree falls in the forest...
You assume it's there because it can be there without being charted or in the database.
I couldn't find anything against it. Again, feel free to quote the reg. I'm not planning any flight like this, it's just a mental game for the thread.
91.177 Minimum altitudes for IFR operations.
(a)
Operation of aircraft at minimum altitudes. Except when necessary for takeoff or landing, or unless otherwise authorized by the FAA, no person may operate an aircraft under IFR below—
(1) The applicable minimum altitudes prescribed in parts 95 and 97 of this chapter. However, if both a MEA and a MOCA are prescribed for a particular route or route segment, a person may operate an aircraft below the MEA down to, but not below, the MOCA, provided the applicable navigation signals are available. For aircraft using VOR for navigation, this applies only when the aircraft is within 22 nautical miles of that VOR (based on the reasonable estimate by the pilot operating the aircraft of that distance); or
(2) If no applicable minimum altitude is prescribed in parts 95 and 97 of this chapter, then—
(i) In the case of operations over an area designated as a mountainous area in part 95 of this chapter, an altitude of 2,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown; or
(ii) In any other case, an altitude of 1,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown.
(b)
Climb. Climb to a higher minimum IFR altitude shall begin immediately after passing the point beyond which that minimum altitude applies, except that when ground obstructions intervene, the point beyond which that higher minimum altitude applies shall be crossed at or above the applicable MCA.
Only one of them has an identifier so I didn't bother to post. The other has a ranch name. Could probably find an example with two airports that have identifiers if I have some time to look around tonight.
The coordinates of the fields are sufficient.
But we'll have to cover the obstacle thing first. If the assumption is that the whole world is littered with 199' obstacles below any possible flight path in the boonies, it changes the scenario significantly.
I don't know about the world, in the US Adverse Assumption Obstacle criteria are used in determining minimum altitudes. The height is 200' AGL.
Here, I took a sec and grabbed what may be a bad example since I just slammed through it on my phone at work here...
1D8 - 3FU
View attachment 44492
And in case you're wondering if the tower is too close...
View attachment 44493
Granted, the obstacles are the kicker almost everywhere else you look around even up there in the boonies. And those are of course, what would kill you.
We don't even have to examine obstacles. You must operate at an even cardinal altitude, the only one within Class G airspace is 2000 but it's less than 700' above the ground.