This is part 2 of National treasure Odensvi.
To solve this mystery you have 2 options:
Option 1: (if you want to do the whole series in recommended order)
You find information about this cache when you successfully finish National treasure Odensvi 1.
Option 2: (if you want to do this cache individually)
1. Go to these coordinates to start:
N 59 34,945
E 15 59,369
2. Open this webbpage:
https://wixtra.wixsite.com/website/om
3. Enter the answer of the following as password:
7703 - 2378 + 401 = ?