opencpn - SERP Analysis

https://opencpn.org/

https://play.google.com/store/apps/details?id=org.opencpn.opencpn&hl=en_US

https://en.wikipedia.org/wiki/OpenCPN

https://www.cruisersforum.com/forums/f134/

https://github.com/opencpn

https://www.reddit.com/r/sailing/comments/1g77y3b/best_open_cpn_alternative_for_ios/

https://flathub.org/en/apps/org.opencpn.OpenCPN

https://forums.ybw.com/threads/opencpn.615382/

https://openplotter.readthedocs.io/latest/opencpn/opencpn_app.html

https://sourceforge.net/projects/opencpn/