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I'll try to re process and let you know what happens.  I don't think I'll ask John M to add my changes.  I just want to add some trails on private land along with the land boundaries.  If this doesn't work, I'll make a transparent overlay.  I actually tried that first, but I must have done something wrong with the levels because the trails were only visible when the map was zoomed out greater than a mile or so.  Thanks.

I didn't remake the preview files since my changes automatically showed  up in mapsource after I dropped the modified file into the directory.  I'll try to re-process the preview files with toolkit and let you know what happens.  If that works, it's still saves a ton of time building from scratch.  Thanks.

When you saved the img file as an mp and exported again as an img, did you have any trouble loading the map to your GPSr?  I did something similar, I think, but now I can't download the overall SEUSA map anymore.  If I put the original img file back, I can download with no problem.

I'd also like to thank John M (and others) for spending what must have been weeks compiling all of that data into a very detailed and extremely useful map of the SE.  I spent a couple of nights gathering data to create a map of Alabama before I noticed the "Custom Maps" link.  Anyway, I realize it was a lot of work and I appreciate your willingness to share it with the world.

I have a question about adding detail to the SEUSA map.  I have some trails and tracks that I suppose I could add as an overlay, but I'd really like to add the detail directly to the img files.  I found and opened  the individual img file that details the area I'm working with in gpsmapedit.  I inserted the gpx data, converted the trails to polylines, etc.  I had to convert the img file back to an .mp file and then export again as an img file (with cgpsmapper) with the same name.  I saved the original img file in another folder in case something happened and exported the img file directly to the SEUSA folder.  I opened Mapsource, selected the SEUSA map, zoomed into the area I was working with, and now all of my new information was there.

The problem comes when I try to export the map to my GPSr.  It creates the mapset and thinks for a minute or so and then gives me an error that the map is 100 MB and only 120 MB is available.  This doesn't make any sense because the available space is clearly higher than the map size.

If I replace the original img file, I can export the same map with no problem.

So is there some information in the TDB or overview img files that require the img files to all have the same created dates?  That's the only difference I can see between the old file and new file other than the size of the new file being 2k higher.