ETOPS Rings?

What do the rings on the ETOPS map display mean? I’m guessing the largest one is the ETOPS time scenario, and the ones around airports represent one hour?


the smallest one around the airport is the “Threshold Distance”, the distance your aircraft can fly with one-engine inoperative within 60 minutes.
The largest one is the selected and approved Maximum Diversion Time.

Both in “still air distance” configuration.

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