***The cache is not at the listed coordinates, but is within 3 km.***
After my younger son placed his first cache a few month ago, now my older one is keen on making a puzzle cache as well as hiding an actual cache. This is his first puzzle to offer you. Since he put #1 in the title, #2 should be coming soon (or not?). Hope you will enjoy his puzzle.
My friend sent me these weird letters. I know I'm good at code cracking but I need your help. Here is the first letter.
You can validate your puzzle solution with certitude.