Definition
Any en route navigation that is not conducted along the signal path of ground-based navigation aids (VOR, VOR/DME, NDB), or is conducted outside the operational service volume of those aids. It typically requires the use of a long-range navigation system such as GPS, IRU, or other approved area navigation equipment to determine position.
Plain English
Flying a route where you can't rely on ground-based radio navigation stations the whole way, so you need self-contained or satellite-based navigation equipment to know where you are.
Context Anchor
Seen in instrument procedure and off-airway route discussions, especially for remote, oceanic, or other long-distance routes away from regular ground navigation coverage.
Derivation
The term is a regulatory classification rather than a descriptive phrase. 'Class II' simply distinguishes it from 'Class I navigation,' which is conducted entirely within the usable signal coverage of ground-based VORs, NDBs, or DME stations. Knowing this pairing helps: Class I = ground-station coverage the whole way; Class II = anywhere outside that coverage.
Why Pilots Care
Determines whether an aircraft meets the equipment and approval requirements for safe flight in areas without ground navigation aids.
Grounding Statement
If the airplane will be outside dependable ground navigation signal coverage for part of the route, the flight may involve Class II navigation.
Intuition Check
Do not confuse Class II navigation with Class B, C, or D airspace, or with a pilot certificate class. Here, “Class II” means a category of en route navigation based on whether normal ground navigation coverage is available.
Example Sentence 1
Because the route crossed a stretch of ocean with no VOR coverage, the flight was planned as Class II navigation and required an approved GPS for primary guidance.
Example Sentence 2
Class II navigation approval allowed the flight to proceed beyond the last usable VOR.