VOR/DME vs VOR Only

VOR Only Navigation

A VOR (VHF Omnidirectional Range) station transmits signals that allow aircraft to determine their magnetic bearing (radial) from the station. Pilots use this information to navigate along airways or to and from specific points. VOR-only stations do not provide any direct distance information—just the direction relative to the station.

VOR/DME Explained

A VOR/DME combines a standard VOR with a co-located DME (Distance Measuring Equipment). The VOR component works as above, giving the radial, while the DME provides slant range distance from the aircraft to the station. This pairing allows pilots to know both their bearing and exact distance from the station, which is critical for accurate position fixing, holding, and approaches.

Key Differences: VOR/DME vs VOR Only

• VOR-only: Bearing (radial) information only; no direct distance.
• VOR/DME: Both bearing and distance; enables fixes by radial and DME distance, and supports RNAV operations.

Operational Uses

• VOR/DME stations are preferred for en-route navigation, approaches, and RNAV waypoints, as they allow for precise position fixes.
• VOR-only stations are still common and useful, but require cross-bearings or other aids for position fixing.

Instrument Displays

• On aircraft equipped with RMI, HSI, or CDI, VOR-only stations display bearing, while VOR/DME stations show both bearing and distance (if the aircraft has DME capability).

Exam Relevance

Expect questions about the difference between VOR/DME and VOR-only, their uses, and how they appear on navigation instruments. Know how to interpret both types and their operational implications.