Crikey - presumably you do have some onboard navaid (GPS? TACAN?) to get down from VFR on-top? Or do you just avoid that situation?
Just GPS and (super) Tans I'm afraid....and a piece of paper, a compass, a watch and a Dalton computer.... what else do you need?
If I remember my air law correctly in a RW ac for VFR flight one needs only to be clear of cloud and in sight of the surface.....the forward visibility minima apply only to FW ac.
Thats only below 3000' AMSL - which it was in this case... They also have a speed limit they must adhere to if the viz is poor - which it was in this case