Crystal River (Nelson/Marlborough) Multi-cache
BuzzTasman: No longer deemed a suitable site due to Didimo !!
Crystal River (Nelson/Marlborough)
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Difficulty:
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Terrain:
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Size: 
(regular)
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An interesting Multi cache that has lots of stunning views
Go to the signboard at the above location and find the DOC number on the back of the signboard.
The last three numbers of that number will equal X
Use that to find the next waypoint using the following:
S40 50.(X+35) E172 46.(X-728)
At this new point find the following info
A = Number of vents in main pool
B = Speed of discharge in main vent
C = Average discharge of water per second in m3
D = First number of water temperature
The final cache is at:
S40 50.(B+2)AD E172 46.D(C+12)
The GPS coverage at the final cache isn't flash but the clue will get you there easily.
Sorry no dogs here as it's DOC land.
Additional Hints
(Decrypt)
Haqre gur rnfgrea raq bs gur evire oevqtr.