This puzzle involves two totally unrelated sets of things. What great luck for me, the puzzle-maker, that exactly 15 items from each of those sets can be paired up, based on something they have in common! The two items in each pair can be associated with a number from one set, and a different number from the other set. Summing the two numbers from each pair results in the numbers shown here (in ascending order):
29, 35, 35, 43, 47, 51, 57, 65, 66, 68, 75, 93, 108, 141, 150
The common characteristic for each pair is a string of alphabetical characters (all strings the same length). Take the character string representing each pair, and convert each letter to a number (using the method well known to cachers). For each pair, sum the digits of the numbers that you have mapped from the character string, repeating the summing as needed until each result is reduced to a single-digit number. Keeping those 15 digits in the same order as the corresponding entries in the first set of numbers, apply the following adjustments to each digit to come up with the final cache coordinates:
-1, +4, -5, +7, +8, +1, 0, -8, +1, -4, -3, -1, -3, -2, -1
Congrats to Beege49 and crosspa for FTF!
Okay, so I missed one, and there are actually 16 pairs (thanks, turuthok!) But it should easy to see which pair to ignore.