The final cache is at:
N 34 15.J
W 118 34.K
To get K, substract 217 from the address and then divide the answer by 22.
Factor the address. Multiple the largest two-digit factor by 7 and the second largest two-digit factor by 5. Add these two numbers together to get J.
Write down the code on the log sheet.
You can check your answers for this puzzle on Geochecker.com.