Pretty much described here:
https://forums.etarc.org/t/97c-303n-5884-p-discussion/173
The p̲a̲c̲k̲a̲g̲e̲ contained a code in Base64: MDEzRDowMDc4OjA3MjQ6MDA1Ng==
This translated to: 013D:0078:0724:0056
This was then tried as coordinates in NMS where a next clue was found.
Edit: corrected .pdf to package