You will need to do a little research about the history of the PCT (Pacific Crest Trail). This is a trail that runs from Mexico to Canada, across three states, California, Oregon, and Washington. I started here http://www.pcta.org/ and then went to where that took me. You will probably need to do the same. Once you answer the questions you will be able to plug the numbers into the formulas and the coordinates will be revealed to you. Part of the difficulty is that I allowed Geochecker to be slightly fuzzy on your answer so your search radius my be a little larger then usual, but in the right general area. Good luck in your quest. July 2011: added checksum where possible, may be helpful, but can also lead you astray.
A = _ _ _ _ (checksum=13)
You will need to find the distance in miles listed on the PCT web site as well as Wikipedia?
(Update, apparently wikipedia changed their listed distance, if you use it subtract the checksum first so it matches the PCT web site)
B= _ _ _ _ (checksum=19)
George Bush wrote a letter for the dedication of the Rogers and Clarke Plaque, what was the distance in miles stated on that letter?
C= _ _ _ _ (checksum=14)
In your research you should be able to locate a map of The Pacific Crest Trail System Conference dated May, 1945. What was the total milage listed on that map?
D= _ _ (checksum=6)
The U.S. Forest Service dedicated a plaque to Rogers and Clarke in 1997, at Soledad Canyon, Calif. How many years of hard work are shown on that plaque?
E= _
The PCT is broken up into how many Districts?
F= _ _ _ _ (checksum=12)
The Skyline Trail in Oregon, part of the original PCT was created in what year?
G= _ _ (checksum=11)
Remember that letter written by George Bush, how many years are listed in that letter?
Now a little math, N45 (A+B+C+D)*E+(F+D+G-1)
S= _ _ _ _ _ (checksum=13)
The highest point on the PCT is Forester Pass at how many feet?
T= _ _ _ _ (checksum=20)
The Cascade Crest Trail in Washington, part of the original PCT was created after the Skyline trail in Oregon. In what year was it created? (NOTE: there are two dates you will find and both fulfill the check sum, so if the GeoChecker doesn't like your number, search the internet for the other date)
U= _ _ (checksum=12)
Clinton C. Clarke, credited with conceiving the PCT died at what age?
V= _ _ (checksum=11)
Warren Lee Rogers, co-founder of the PCT died at what age?
W= _ _ _ (checksum=5)
Cascade Locks, Oregon is the lowest point on the PCT at what elevation in feet?
X= _
The PCT is broken up into how many Districts?
Y= _ _ _ (checksum=17)
According to wikipedia, Scott Williamson was the first person to Yo-Yo the PCT in 2004, how many days did it take him?
Z= _ _ (checksum=5)
Wikipedia says that Clarke conceived the PCT in 19??
Now a little more math, W121 (S-(T+U+V+W+Y+Z))*X+1
You can check your answers for this puzzle on Geochecker.com.