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The bridges of Hisingen Mystery Cache

Hidden : 10/02/2003
4 out of 5
2 out of 5

Size: Size:   small (small)

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Geocache Description:

Don't try to find something at the position above.
This is a research cache. Most of the work has to be done at your desk. When you finally have the position of the cache you will end up at a place that you probably haven't visited before. :)

2008-01-06. Now you can find the answer to question no. 3 (which has caused som confusion) right here on the page if you look carefully :-)

2005-07-22. Hopefully the last adjustments after the move...

2005-04-20. There has been some changes, both in the formulas and the final position.

You have to find the answers to all of the clues and use them in the formulas below. You don't have to visit the listed bridges, only the last one. If you don't want to travel, you will need a map or a mapping program. The answers can preferably be found on the Internet but could probably be found at a library or somewhere else. 

The clues will be a bit difficult to find if you don't understand Swedish.  

The cache, a 0,5 litre Curver-like box.

Bridge number Position Clue
1 N57 41.476 E11 54.077 Year of construction
2 N57 42.873 E11 58.026 Year of construction
3 N57 43.740 E11 59.613 Sailing clearance (m) = 5,9
4 N57 47.979 E12 00.829 Length (m)
5 N57 51.329 E12 00.535 Sailing clearance (m)
6 N57 51.590 E11 59.855 The construction year of the nearby fortress
7 N57 51.899 E11 58.384 The road number

The actual cache is at :


where the letters correspond to:





Use the integer part (Sw: "heltal") when you have to round the figures.

Please always confirm the final position by mail before you go there since some of the questions are possible to find more than one answer to! Or use Geochecker (Link below)

TIP! There is a good parking area 200 meters from the cache, in about 330 degrees.

You can check your answers for this puzzle on

Additional Hints (Decrypt)

Pybfr gb gur haqre fbzr fgbarf, va n dhvgr ynetr pnivgl.

Decryption Key


(letter above equals below, and vice versa)