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 frequently misunderstand that GPS approaches often don't require explicit "activation" if already properly loaded and set for sequencing, which is typically indicated by specific magenta arrows in the flight plan.
The autopilot's APR (approach) key is widely confused with activating a GPS approach; however, it is a distinct function of the Automatic Flight Control System (AFCS) and not related to GPS approach sequencing.
The APR key primarily engages the autopilot/flight director to track both lateral guidance and, crucially, vertical guidance (glideslope/glide path) for descent on precision approaches, particularly once "cleared for the approach," whereas the NAV key handles lateral tracking.

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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.