So I am often asked what do I run on my Raspberry Pi and what software do I like.
qtVLM is a French made charting software made for Android, iPhone, iPad, MacOS, Windows, Linux and yes even the Raspberry Pi.
Its a very well polished software package that provides just about everything you want in a chart plotter software. It runs reliably and so far has proven to be accurate in its calculations and trustworthy.
I would highly recommend qtVLM.