The cache is NOT at the above coordinates.
The above coordinates however, are somewhere on the chess board,
not necessarily a particular square.
Firstly though, let’s locate the chess board.
a6 is at coords N 44º 19.949 , W 076º 36.530.
g1 is at coords N 44º 15.619 , W 076º 28.736.
To clarify the Chess board, Assume the earth is flat, thus the
squares will NOT get larger as they head South
Do not convert everything to UTM, keep it as Degrees,
minutes, decimals of minutes. That will ensure the figures stay
exact.
Now for the pieces themselves:
BLACK has: Qg8, c7, Kc6, e6, b5, b3
WHITE has: Na8, Nf8, a6, g6, Ka5, b4, Rd1
WHITE to move and checkmate in 3 moves.
Cache is at coordinates of where the piece moves to, that creates
the checkmate.
I have just been notified of the FTF. You can check your answers
for this puzzle on
Geochecker.com.