OK... I see how to "Export Background Raster" by right clicking on the map it self. I guess I'd create a folder to export it to.
Associated KML files? I can't seem to find those. I have a kmz file for my shoreline background. (And if you'll remember, that's a shoreline for the entire large lake) That what you mean? Update: Figure this part out. The learning curve continues!
IMC process by hand? I'll have to figure that one out.
The rest sounds good, like single raster layer and all my map segments will show up on top.
As for vector, maybe it's just me, but my maps, and there are 5 different lakes on one SD card so far, (each with their own 'renamed' Shaded Relief folder and renamed at5 and xml files) look great (on the Lowrance) in raster but lousy in Vector. It's kind of like the difference between a regular TV and a HD TV. I'd hate to have to lose that.