The LFrank Quandary Letterbox Hybrid

Cache is not at the posted coordinates. Don't go there. Under no circumstances should you try for this cache after 5:00pm. The stamp in the container is not a trade item. Please leave it with the log.

At a recent event I was talking to the famous and humble LFrank about what kind of puzzles he does and doesn't like. Turns out he doesn't want to install any software on his computer or basically do anything hard to figure out an answer. So this puzzle is just for him. This puzzle took quite a bit of work so be patient. Just get the values for A through J and plug them in.

A = 1 + 2
B = 8 - 4
C = 3 + 0
D = 9 - 6
E = 3 + 3
F = 2 - 1
G = 4 + 5
H = 3 + 5
I = 2 + 3
J = 0 + 9

Final is located at N38 AB.CDE W090 FG.HIJ

Just in case you are having trouble, here's a Geochecker.

Good luck!

Please observe posted hours. Failure to do so will result in you possibly not being able to drive out.

A little about letterboxing: Someone hides a waterproof box somewhere (in a beautiful, interesting, or remote location) containing at least a logbook and a carved rubber stamp, and perhaps other goodies. The hider then usually writes directions to the box (called "clues" or "the map"), which can be straightforward, cryptic, or any degree in between. Often the clues involve map coordinates or compass bearings from landmarks, but they don't have to. Selecting a location and writing the clues is one aspect of the art.

Once the clues are written, hunters in possession of the clues attempt to find the box. In addition to the clue and any maps or tools needed to solve it, the hunter should carry at least a pencil, his personal rubber stamp, an inkpad, and his personal logbook. When the hunter successfully deciphers the clue and finds the box, he stamps the logbook in the box with his personal stamp, and stamps his personal logbook with the box's stamp. The box's logbook keeps a record of all its visitors, and the hunters keep a record of all the boxes they have found, in their personal logbooks.