C120 route import from iMac

Good day

I've searched the forums and the Raymarine site with no luck.
I'm pretty sure of the answer, but wanted confirmation before I give up.

I have an older C120 Classic and I would like to be able to import routes created on my iMac (.gpx files) is there any way to do it?
BTW, I do not have access to a PC nor do I wish to purchase a copy of Windows.

As a last resort, I'll even take the file specs for the .FSH files and build my own conversion utility!

Thanks for any and all help,

Carlos A. Mendoza
S/V Rocinante