So i decided to make one myself. It is based on the excellent Triatlas and used with permission. The app will be free of charge (maybe i'll make a pro version later with integrated memo recorder). Stars up to 12.6 and galaxies up to mag 15.7.
The features in te upcoming release are:
intuitive navigation (index-chart with all constellations zoom in to subcharts)
atlas zoom, pinch, scroll,
Future versions will have
memorecorder (with GPS stamp)
Note that it is an atlas: no planetarium features or searching (yet). But it will suit my needs. What do you think?