MP Flight Map Red Circles Around Airports

I am using Mission Planner 1.3.19 operating in the Phoenix Valley. 3 of the towered airports have red circles with white dashed lines around them and the rest do not. Are these geo-fences or just a visual alert that you are within 3nm of the airport? Not that I will fly without permission, but will APM 2.6 arm within the circles?

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