How to Eliminate Approach Key Confusion for Pilots

Knowing when to use the function doesn't need to be difficult.

Max Trescott

Friday, November 14, 2025 at 08:00 AM ET

Verified

Edited By:

Travis Tingle

The APR and autopilot keys are shown mixed in with other keys. [Credit: Max Trescott]

Key Takeaways:

Pilots often confuse the autopilot's APR (approach) key with "activating" a GPS approach, despite these being distinct functions of the GPS navigator and the autopilot.
The APR key's primary role is for the autopilot to track lateral navigation and, crucially, to couple with the glideslope or glide path for vertical guidance on precision approaches.
A GPS approach is considered "active" when the GPS navigator is correctly loaded and sequencing (indicated by visual cues like magenta arrows), which is a separate process from engaging the autopilot's APR mode.
Modern glass cockpits can contribute to this confusion by integrating controls for different systems, making the individual functions of components like the GPS and autopilot less distinct.

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In September, I talked about what I call the myth of activating the approach. Many pilots seem to feel they need to activate something in their GPS to fly an approach.

As I pointed out, I often hear pilots say, “Now I have to activate the approach,” when in fact their GPS is already set up correctly for it. If you’re under that impression, please go back and read that column in FLYING Magazine Issue 962.