Mastermind Mystery Cache

The cache is not at the listed coordinates.  In order to discover the correct coordinates, you must choose "Geocaching" as you specialist subject on Mastermind. Where the answer is a letter, convert it to a number in the usual way, ie A=1, B=2 etc. Small edits on the puzzle and a change of question 6 to make it easier were made on Boxing Day to help a little. Also corrected glitch in last digit of west coordinates. On 5.10.18, I changed question 12 as I think the answer to the new question is quite interesting (but that might just be me!) and adjusted the formula for L.

Your time starts now-

1. What is the name of the oldest active cache in the world?  First letter = A
   
2. Who placed the first cache?  First letter of first name = B
   
3. What was the name of the ill-fated attempt to re-introduce virtual caches in 2011?  First letter = C
   
4. What does the W in WAAS stand for? Last letter = D
   
5. Which Warrington cacher placed a new virtual cache on geocaching.com in the local area in 2017? Third letter = E
   
6. What is the worlds most southerly virtual cache?  First letter of third word = F
   
7. Who was the first recorded person to suggest that hides should be called geocaches?  Second letter of surname = G
   
8. The number of active hides of which cache type doubled exactly in 2017?  First letter of second word = H
   
9. In which city was the world's first recorded geocaching event (one word)?  Last letter = J
   
10. In which city is Groundspeak’s Headquarters? Last letter = K
    
11. In which of the 50 US states is the most easterly cache placed in the USA? Second letter = L
    
12. What is the cache code number for the last travelling cache to be published on geocaching.com- hint it was published after travelling caches were banned and has traveled further than any other travelling cache?  First number in code = M

Which brand- Beep, beep, beep- I've started so I’ll finish-

     13. Which brand sponsored toy car travel bugs for several years?  First letter = N

The cache can be found at:

N53 PQ.RST  W2 2U.VWX

where:

P = G-F

Q = N-M

R = E-H

S = D-K

T = E-B

U = E+C

V = J-L+4

W = A-N-1

X = D