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The heywhatsthat range rings can be permanently added to dump1090-fa map and dump1090-mutability map as shown in above screenshot.
The step-by-step method is given in April 2017 thread Bake a Pi.
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dump1090-fa map
Scroll down to:
“8 ):** ADD TERRAIN LIMIT RINGS (OPTIONAL)**” -
dump1090-mutability map
Scroll down to:
11) ADD TERRAIN LIMIT RINGS (OPTIONAL)
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This was already taken care of in the wget command of the April 2017 posts linked above,
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