Owl-Bay Mystery Cache
alpros: cache will be removed during the next days
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Difficulty:
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Terrain:
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Size: 
(micro)
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Easy puzzle in the middle of Lill-Jansskogen.
Uggleviken (Owl-bay) is a former bay and lake at Norra Djurgården. Today it's a marsh and one of the most interesting botanical and ornithological areas in Stockholm.
In 1902 a pavilion was build to remind on when Stockholmers in great numbers went to Uggleviken on "trefaldighetsafton" - the first Saturday after Whitsun - to drink the health giving water from the spring which is called Ugglevikskällan.
Go to the information sign at
N 59°21.164
E018°04.403
1. How many zeros are in the Swedish text?
Cross total - 1=A
2. Count the number of owls you see in the building close to the sign.
Cross total=B
3. How many corners does the buildings roof have?
X=C
4. C-B+A=D
N D9°2A.ACD
E0AC°0B.BB9
The calculated coordinates take you to a spot about 50 m away but not all the way to the cache; very close though you'll see something to sit on and that's where you'll find the cache.
The cache is little tin box containing a disclaimer, a pencil and logbook, the box is NOT suitable for trading items.
Don't remove the box itself (if you would even manage to ... I couldn't once it was in place ;)), the front of the box can be opened by pulling the lid carefully towards you taking it from the left. The logbook can easily be removed. There is a pencil in the box but bring your own pen just in case.
Additional Hints
(Decrypt)
fvg naq frrx ybj, pbhyq or zntargvp ohg vf abg