Uncontrolled Airspace

Uncontrolled airspace (Class G) is airspace in which no ATC service is provided. Pilots are entirely responsible for their own separation from other aircraft, terrain, and obstacles. Flight in uncontrolled airspace requires no ATC clearance but does require compliance with all applicable flight rules.

Class G Characteristics

  • No ATC service — pilots provide their own separation
  • VFR weather minima apply (reduced compared to controlled airspace)
  • No transponder requirement (though Mode C is strongly recommended)
  • No radio communication requirement (broadcasts on ATF/MF are best practice)
  • Most Canadian airspace below controlled airspace floors (typically 700 ft or 1,200 ft AGL) is Class G

IFR in Class G

IFR flight is permitted in Class G airspace but ATC cannot provide separation. The pilot must self-separate from VFR traffic by see-and-avoid. IFR operations in Class G are common in northern Canada where radar coverage and VHF range are limited.

Related Terms

See also: Classification of Airspace, Controlled Airspace, VFR.