Queen Anne F.C. Mystery Cache

The given coordinates are only good for ball games and out-of-control hooliganism (Upper Queen Anne-style). In fact, they won't even put you on the right playing field. Everything you really need follows.

markta's puzzle caches have defined the landscape of Seattle's Queen Anne neighborhood, making it one of the city's best areas to find great caches (see, for example, Queen Anne Quandary 3). They are elegant, well-thought out creations, and in thanks for his contributions to the game I am hiding a rough and dirty puzzle up here on the hill to highlight that fact. Enjoy!

First Half: "SMC xx.xx.xxx" (AB.CD.EFG)

H = B / D
I = F - A
J = G + C

Second Half: Adjust the coordinates of the first stop to find the final cache

Subtract .EAH from the latitude
Subtract .JCI from the longitude

47° xx.xxx    122° xx.xxx
-       .EAH     -        .JCI
------------     -------------