 Above 10,000 ft MSL, the visibility requirement is extended to and the cloud clearance requirement is extended to below clouds, above, and laterally.Class F is not used in the United States.In Canada, Class F is the equivalent of U.S. special use airspace including restricted and alert areas, while ICAO defines it as a "hybrid" of Class E and Class G, in which ATC separation guidance is available but not required for IFR operation.