Hi,
by default GraphHopper uses OSM maps. I’ve read that it is also possible to use other maps, for example from Here.
Are ther any leads, hints how to achieve this?
TIA
Kibu
GraphHopper can be used with several map engines, it depends also on the platform (mobile, desktop, web).
It’s important to combine “similar” map and routing data.
e.g. if map & routing data are not compatible, you may see routing on non rendered streets and vice versa. 
An interesting project in this regard might be https://github.com/knowname/morituri which converts commercial map data (HERE maps) into OSM and it is tested with GraphHopper
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