The answer to the title question is in the image below. Ewe should study the shown portion of the Periodic Table of Elements for the numbers needed to complete this equation: A+B=SEE? Note: I have knot altered the table.
Subtract SEE? from the last 3 digits of the north and west posted coordinates, and you'll find a small Loch and Loch hidden there.
Oh, by the way:
A = the atomic number of the answer.
B = the atomic mass of the answer, rounded down to the nearest hole number.
