Breaking a Teenager's code Mystery Cache
Eagles1181: This was my first puzzle and it has had a good run. However, its time has come. I am achieving it to open up room for somebody else.
Breaking a Teenager's code
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Difficulty:
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Terrain:
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Size: 
(micro)
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***POSTED COORDINATES ARE BOGUS*** (Did you really think it was in the middle of the freeway?)
9,76a,63b,86a
34,23,26b,7
22a,74,27b
14a,54b,23,63a,60a
26a,53,23,52b
73a,72a,87b,32b,34b
22a,74,8
69a,74,76a
8,10
87a,8,44b,36b
***The degrees are correct, the code starts with the minutes.***
Back in high school, a friend and I were trying to come up with a secrete code. We tossed around a couple of ideas, but they were all either impractical, or to easy to break. Then I had this idea. We sat down at the table in his kitchen to see if it would work. Turns out that it did not work because one letter could not be used. Luckily (or unluckily) for you I do not need that letter to spell out the cache coordinates. ***Congrats to FamilieRyan for snagging the FTF***
Additional Hints
(No hints available.)