Cumulus Installed fine on my nexus 7. Displayed map and GPS position but no airfield or airspace info. No amount of tweeking of the Settings made any difference. All of the appropriate files were present in cumulus folder. Pity, because I liked the overall simplicity of the application. The stars awarded are based only on my experience and are probably on the low side.
Excellent value for money! A very good app to manage most gliding prep and execution tasks.
Android linker complains partly fixed. Max SDK set to API Level 23. App is due to new Google restrictions not runnable starting from Nougat. Working on fix.