What are departure radials based upon?

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Multiple Choice

What are departure radials based upon?

Radials are fixed bearings that extend from a navigation aid. Departure procedures use these established lines to define the initial direction away from the airport, creating predictable lateral separation. The reference tied to this idea in many systems is TACAN, which provides a precise bearing from the station and thus a specific radial. When a SID or departure route is described in terms of a radial, it’s usually a TACAN (often paired with VOR as a VORTAC) reference, giving a clear, unchanging lateral guide for the aircraft to follow after takeoff. GPS-based RNAV departures can also exist, but they aren’t the traditional fixed-radial reference being described here. ILS is an approach system and isn’t used to define departure radials.

Radials are fixed bearings that extend from a navigation aid. Departure procedures use these established lines to define the initial direction away from the airport, creating predictable lateral separation. The reference tied to this idea in many systems is TACAN, which provides a precise bearing from the station and thus a specific radial. When a SID or departure route is described in terms of a radial, it’s usually a TACAN (often paired with VOR as a VORTAC) reference, giving a clear, unchanging lateral guide for the aircraft to follow after takeoff. GPS-based RNAV departures can also exist, but they aren’t the traditional fixed-radial reference being described here. ILS is an approach system and isn’t used to define departure radials.

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