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This GeoCache is one from a series of seven. Solve the first six to master the seventh!
GC5GCXC - GC5GCXE - GC5GCXH - GC5GCXK - GC5GCXP - GC5GCXW - GC5GCXY
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The challenge:
Reference Points: 30111, 30112 and 30113.
Final Point: 21009 (GeoCache).
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Coordinates 30111: 31U 708987,119 5610908,426
Coordinates 30112: 31U 708421,485 5605381,154
Coordinates 30113: 31U 704775,203 5609333,504
Coordinates 21009: 31U . . . . . . , . . .? . . . . . . . , . . .?
All points 30111, 30112 and 30113 are on the circumference of a circle, which centre is 21009.
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Find a spoiler-photo of this GeoCache in the gallery of TravelBug TB4K60V.
Please equip yourself with a ballpen to log your visit! A little ladder will be helpful, too!
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Thank you for the totality of 20 
for this GeoCache-X-series!
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