Definition
A selectable operating state in a GPS or flight management system that activates the higher precision and tighter course guidance required for flying an instrument approach. When approach mode is active, the receiver narrows its course deviation scaling, may enable vertical guidance on approaches that support it, and confirms that the unit is configured to fly the final approach segment to published minimums.
Plain English
A setting in the GPS that switches it from regular en route navigation into a more sensitive, more precise mode designed for flying an approach down to the runway.
Context Anchor
Seen on GPS navigators and flight displays while loading, arming, or flying a GPS instrument approach.
Why Pilots Care
It supplies the precise guidance needed to stay on the correct path in low visibility or at night.
Grounding Statement
When approach mode is active, small left-right errors show more clearly because the GPS is giving tighter guidance close to the runway.
Intuition Check
Approach mode does not mean you have been cleared by air traffic control to fly the approach, and it does not mean the airplane will fly the approach by itself. It only means the navigator has switched into its approach guidance setting.
Example Sentence 1
Two miles outside the final approach fix, the pilot confirmed the GPS had transitioned to approach mode before continuing the descent.
Example Sentence 2
With approach mode active the autopilot kept the airplane aligned with both the runway centerline and the descent angle.