Is it possible to switch from VFR to IFR and back?

In article ,
Mxsmanic wrote:

Ron Garret writes:

If you can't see anything out the window and you are VFR then you're
already screwed. Time to declare an emergency.

Well, if you are equipped for instrument flight and rated for it and
there isn't too much traffic, I wouldn't call it an emergency,

Then you are missing something very fundamental: there is more to IFR
flight than simply flying by reference to instruments. It is also
flying according to a much more rigidly planned and stylized repertoire
of routes and maneuvers designed to keep you from hitting not only other
airplanes but also (and more importantly) terrain. That is why even
instrument-rated pilots flying instrument-equipped planes die on a
regular basis as a result of VFR flight into IMC.

although you do need to get flight separation services or get back to
VMC as quickly as possible.

That takes time. How are you going to keep from hitting things in the
meantime?

I have no idea what you mean by 'flying IFR "unofficially"'.

Flying using instruments even though you haven't filed an instrument
flight plan. For example, my habit of flying with a GPS or by
following VORs rather than looking for landmarks out the window.

Flying using instruments is NOT the same thing as flying IFR.

rg