[S.T.A.L.K.E.R.] Series.
The cache isn't located at the given coordinates. To find the container solve the following riddle!
You've found a map on a corpse during your last adventure, but besides one marked spot, it seems pretty useless and like a regular map. Maybe some further investigation and analysis will deliver information on how to use this map!

Once you found the solution, verify it with the geochecker. If your result is correct, you recieve a list of special tools required and a description for the waypoints.

Thanks a lot to Kuhfra030 for helping me with the T5 part of the cache!
Also a big thanks to our Beta Testers Yanchia and Luma0309! :)