One day on my way to Souvenir City I was waylaid by a stranger named Jack who assured me I could find a cache at the following location:
A55 N67 N42 N02 A16 N20 A51 N98
After swatting away a big fly, I left the yard and made the round trip to the site, where I found that the stranger was right! Won't you come see for yourself?
You can validate your puzzle solution with certitude.