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The right side set of circles is for things that are Undetected. In map 2, I have four sets of circles instead of three; and those total of sets  would roughly match a Johari Window of threats: visible-known in the large circle set in the center, and three smaller circles for tracking hidden-known, blind-unknown and unknown-unknown areas . For me, I'd either use each hex as a 2 mile sub hex, for  6 mile hex, that maps to a larger hex grid.