Northern Domestic Airspace

As geographically delineated in the Designated Airspace Handbook (DAH), a subdivision of Canadian Domestic Airspace (CDA) commencing at the North Pole and extending southward to the northern limit of the Southern Domestic Airspace (SDA).

Glossary: Arctic Control Area
A controlled airspace within the Northern Domestic Airspace (NDA) at FL 270 and above.
Glossary: Northern Control Area
A controlled airspace within the Northern Domestic Airspace (NDA) at FL 230 and above.
Glossary: Radial
A magnetic bearing from a VHF omnidirectional range (VOR), tactical air navigation aid (TACAN), or VORTAC facility, except for facilities in the Northern Domestic Airspace (NDA), which may be oriented on true or grid north.
Glossary: Southern Domestic Airspace
As geographically delineated in the Designated Airspace Handbook (DAH), all airspace within the Canadian Domestic Airspace (CDA) commencing at the Canada-United States border and extending northward to the southern limit of the Northern Domestic Airspace (NDA).