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?

@dlrk56

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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