How is the marker sound created?

I wonder how the sound when passing a marker beacon is created?
Is it from position or from the real marker?
Is it from position or from the real marker?
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jonewborg@telia.com wrote:I wonder how the sound when passing a marker beacon is created?
It's created thru automatically deriving (calculations) a zone theoretically projected out from the runway. When your GPS position conforms, the sound plays.
Is it from position or from the real marker?