Plain English Meaning
TACAN is a navigation aid used mainly by the military. It tells a pilot two things from one ground station: which direction the station is from the aircraft, and how far away it is.
Full Definition
A military ultra-high frequency (UHF) navigation system that provides an aircraft with both bearing (direction) and slant-range distance to a selected ground station. TACAN ground stations are often co-located with civilian VOR stations to form a VORTAC, allowing civil aircraft to use the distance (DME) portion while military aircraft use the full bearing-and-distance signal.
Context Anchor
You may see TACAN on aeronautical charts, in military flying information, or near facilities where a military navigation station is part of the navigation picture.
Derivation
From 'tactical,' meaning related to military operations, plus 'air navigation.' The name reflects its origin as a system designed for military aircraft needing accurate position information in operational settings.
Why Pilots Care
Gives precise navigation data in areas where civilian VOR/DME coverage is unavailable or during tactical operations.
Intuition Check
TACAN is not a route, clearance, or procedure. It is a navigation system that sends information an aircraft can use for direction and distance.
Example Sentence 1
The instructor pointed out that the navigation aid on the chart was a VORTAC, meaning it combined a civilian VOR with a military TACAN.
Example Sentence 2
Military aircraft often rely on TACAN for accurate positioning when operating over remote areas.