Ymer is getting on a bit, and has decided to move somewhere warmer than his Nordic territory. Here will do nicely! Ymer is said to be the oldest and largest Troll in Nordic Mythology, and is also considered to be a giant. He also has an aka of Aurgelmir.
The cache is not at the posted coordinates. But you will need to go there to get the information for the final.
At the posted coordinates, look for the street sign and look at the name. Take the number value of each letter and add them together, then multiply this sum by 3.
Let the result equal X.
The final coordinates are;
S34 04. ( X + 59)
E150 44. ( X + 5)
Checksum (last 3 digits) S = 8 E = 17
As always BYOP