VFR = Visual Flight Rules
Doesn't ENR 1.2 (para 1.1.1) of the Aussie Aeronautical Information Publication (AIP) state that for VFR flight when operating at or below 2000ft above ground or water that the pilot is able to navigate by visual reference to the ground or water.
ENR 1.2 (para 2.6) states that in class G airpspace, at or below 3000ft AMSL or 1000ft AGL whichever is the higher you must be clear of cloud and in sight of ground or water.
Both these references do not stipulate DVFR or NVFR just VFR.
I suppose that if you are above these heights then no, you do not have to be in sight of ground or water!
There is also a Flight visibilty requirement of 5000m.
So, the question is;
If you do not have or cannot see a horizon, then how do you maintain the minimum 5000m viz or stay clear of cloud or possibly have to maintain ref to gnd or water.
chears