@Butters
Yes, you've got it now. Your first paragraph is correct also. I do have a gmapsupp.img file made from mapsource years ago. I did use GMapTool to create an installation for mapsource and it works fine. I can see the bluechart areas, etc.
What I'm having trouble with is trying to re-install bluechart americas v8.5, the version that created the above gmapsupp.img but without the CD (which I have somewhere). I thought I could just take all the 5000 .img files in my old Garmin folder and somehow import them into mapsource. I did try to do this with GMapTool like above. I did get the install.bat file but after running it and starting mapsource, it just gives me that vertical yellow line. So I guess I'm not thinking right and really I have to get my CD and re-install properly, yes??
BTW, I did find yesterday MapsetToolkit from years ago. I think it does what GMapTool does, yes?? I thought MapsetToolkit could create the .reg entries. I'm tempted to try it.
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