- OpenCPN(OC), is the plotter software where You navigate and handle charts
- SignalK(SK), is the software where all the sensor inputs are handled. Could be NMEA data or SK formated inputs
- OpenPlotter(OP), is the administration shell where all is administrated and also handles these functions.
As You investigate the different software packages You will see that there are some overlap in the functions.
With OC 5.2 + there was several updates....