Fredriksten Slave Cemetery is NOT a burial ground for slaves, as stated in the description for the first incarnation cache at this site. The bodies buried here were criminals that were condemned by the justice system to forced labour at the nearby Fredriksten Fortress. Slavery as the rest of the world knows it were forbidden by law in Denmark-Norway as from 1802. What happened in 1845 was that they stopped using Fredriksten as a labour camp and transferred the "slaves" or prisoners to Akershus. When placing historically themed caches it's very important to get the facts straight.
Enough about that. This is a sacred burial ground, and you shall behave properly. No stepping on the graves. No digging. No spitting and littering. Respect the dead.
The cache is your standard lock-and-lock and is hidden in the outskirts of the burial ground. Pleace replace exactly as found!
Oh, I almost forgot. That extra waypoint are the coordinates for a fixed geographical reference point for the national geological surveys. Make sure to visit it and leave a note on how many meters off your GPSr are :D