[RBJ]

When I say "open", I mean well documented standards. The format that the charts are stored on the Navionics cards is not publically documented.
I was able to develop MacENC following the S-52, S-57 and S-63 specifications.

And thanks very much for doing so. It's an excellent application.

I guess in this brave new digital world we are at the mercy of copyright holders.

I suspect that what is going on might be illegal. Consumers are being prevented by copyright holders from using legally purchased content on legally purchased equipment.

I've asked Raymarine why they have restricted my use of my Navionics card to their plotter, their card reader (not available) and their planning software on a computer platform that they have chosen. No answer yet.

If you got hold of the Navionics "standards" might MacENC evolve to read their charts?