In the HarzApp of the Harzer Tourismusverbandes e.V. you can find all route descriptions and the GPS data to download - so you don't need a map or the signs of the Volksbank Arena Harz.
You can directly scan the QR code for apple and android. Ore here via link:
The Harz as App for iPhone, iPod touch and iPad in the iTunes App Store
The Harz as Android App on Google Play