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Vfr-on-top

VFR-on-Top
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VFR-on-top. ATC authorization for an IFR aircraft to operate in VFR conditions at any appropriate VFR altitude.
VFR over-the-top. A VFR operation in which an aircraft operates in VFR conditions on top of an undercast.

VFR-On-Top
You file an IFR flight plan with VFR-on-top. At 180 degrees magnetic course you should fly at even plus 500' altitudes. A pilot must comply with VFR visibility, distance from cloud criteria and minimum IFR altitudes from FAR Part 91.

Other information may be requested if needed by ATC for separation/control purposes. It is frequently used by aircraft which are airborne and desire an instrument approach or by aircraft which are on the ground and desire a climb to VFR-on-top.