For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rogeroberholtzer:branches:Application:Geo/openSUSE_Tumbleweed/home:rogeroberholtzer:branches:Application:Geo.repo
zypper refresh
zypper install navit
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rogeroberholtzer:branches:Application:Geo/15.6/home:rogeroberholtzer:branches:Application:Geo.repo
zypper refresh
zypper install navit
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rogeroberholtzer:branches:Application:Geo/15.5/home:rogeroberholtzer:branches:Application:Geo.repo
zypper refresh
zypper install navit