speaking of user-contributed naval charts, theres a (german) site attempting to reproduce openstreetmap for boats @ openseamap.org

Hi, I stumbled upon by accident - I now have the latest stable version and it works a treat on my system - I am without charts for much of my areas but I'll start building them up bit by bit: I do have some vector pilotage of the local islands but they are not ECN format - I think they are all AI or Shapefiles.

Thanks for the pointer - Dave have done some astonishingly good work there.

Tim
aka Rhoel

Have you seen the OpenCPN project? Open source leisure craft navigation under active development. https://sourceforge.net/projects/opencpn/ There is also a thread on this site..