Geo-Logic Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(small)
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When I arrived at the place, let's call it the IJKLM spot, my display showed the digits 4 7 3 9 3 3 8 1 2 2 1 9 4 6 3. Looking down I could see a five-digit number in clear white numerals. I knew immediately that this would make a great geocaching puzzle. To solve the puzzle you'll need to go to the same place and find in plain sight the IJKLM digits for the coordinate formula below. They're the only numbers in the vicinity, so there won't be any confusion.
The 4 7 3 9 3 3 8 1 2 2 1 9 4 6 3 digits are just part of what you need to locate the IJKLM spot. You must get the other part on your own. I will tell you only that the missing part is GAMMA DUSTUPS and that once you have it you'll be ready to go to the IJKLM spot. I know it's hard to believe that I've given you sufficient information, but I have. You only need to add a little insight. Of course, knowing the coordinates for the cache is only the first step. You still have to find the cache.
The cache is at N47 39.LIK, W122 19.JMI.
Disclaimer:
The cache is within a mile of the coordinates posted at the top of the page and is not on private property.
Clarification:
At first glance this puzzle may look like a dust off of my Prime Cache puzzle. But though the description may look similar, the puzzle is different. Here you must know your A, B, C's as well as your geocaching craft.
Don't bother looking for the IJKLM spot until you understand GAMMA DUSTUPS. If you find yourself searching on a steep stairway, you're in the wrong place.
Additional Hints
(Decrypt)
Bar Jnl: Svaq bai, genafyngr, svaq VWXYZ, genafyngr.
Nabgure jnl: Frg TCF, svaq VWXYZ, svaq svany, er-frg TCF.