Plain English Meaning

DVFR is the version of VFR flying you must use when crossing or operating in an Air Defense Identification Zone. You file a special flight plan, stay in radio contact, and keep your transponder on so the military and ATC can tell you apart from an unknown aircraft.

Full Definition

A set of flight rules applied to VFR flights operating into, within, or out of an Air Defense Identification Zone (ADIZ). A DVFR flight plan must be filed before the flight, and the aircraft must maintain a two-way radio capability and a working transponder while operating in the ADIZ. The rules exist so that civilian VFR traffic can be identified by air defense authorities and not mistaken for an unknown aircraft.