International Airspace Regs - need Guidance
 

International Airspace rules - Guidance please
What are the Rules for flying in International areas outside of the airspace of a particular nation - such as in the middle of an Ocean ? Particularly below FL 120, and here, by a UAV. What Airworthiness/Navigation/Comms/Rules of the Air are there (less discussion on the UAV side, more the Rules & Regs?

Is a digitised map of the Global (World's VFR/IFR Airspace perimeters available, and if so from where, and to what accuracy (deg/mins or nm), and anyone know what format ?

Answers on a postcard - shouldn't take a minute !

Many Thanks to anyone who can help !!
:hmm: