Inhabitants from Gallifrey Mystery Cache

Do not go to the published co-ordinates, the Cache is not there.

To work out the location,decode each lettered clue to give the numbers 1 – 13.

Then use the numbers to replace the letters and calculate the co-ordinates of the cache.

A = Jon Pertwee

B = Tom Baker

C = William Hartnell

D = Matt Smith

E = David Tennant

F = Sylvester McCoy

G = Peter Capaldi

H = Jodie Whittaker

I = Christopher Eccleston

J = Peter Davison

K = Paul McGann

L = Patrick Troughton

M = Colin Baker

The cache is located at:
 

N51° (E + G + K + C). l J (F - B - A)

W000° ((H * A) + C). (E - K) (A - C - L) M