You can find vdr, debugger, pypilot, chartscale and projections on the app store already as opencpn plugins free. Try it out.
I broke the touch screen
on my tablet (water?) so I plugged a mouse which is ok.. but doesn't allow me to fully test things.
I have climatology, watchdog, celestial, plots, statusbar, objsearch, all working,
halfway weatherfax working as of today, seriously stupid tedious to fix problems.
I did not try weather
routing or draw plugin yet because these are the most difficult.
I did not write the draw plugin, not sure if I should make an android port.
Since it's impossible to use raspberry pi to develop android (yes they require x86 processor to develop for arm processor) I have to use a less efficient x86 machine. My batteries
(9 years old) are so bad they dropped to 11.3 volts today I had to stop working, even when I aimed all my solar panels
too many clouds.