Don't think that's going to be in the offering for a while unless one of the techie types here can do it and pass it along to the rest of us.
Here's a site that I found that I use for trails, topo etc. for my GPS units for land based activities:
http://www.gpsfiledepot.com/
There are some forums associated with the site - maybe if someone sends the coordinates to one of the map makers there, they'd be up to the task.