Hi h.n.w.f.y.w,
Good day.
Is your firmware currently on the WW-14.0400.1905.067?
Have you turned on the " High accuracy" location mode? (settings> location> mode > " High accuracy" )
Have you tried to download areas and navigate offline? Please kindly refer the instructions as below: https://support.google.com/maps/answer/6291838?co=GENIE.Platform%3DAndroid&hl=en
Thank you.