Mapsource needs 2 other files than the .img file. Its been a while but I think cgpsmapper program can compile an .img file and produce the two missing files, which you then have to copy into your garmin library and configure your registry to point to these files. Search the net for more precise info.
If you only have the .img file you can use mapsend20 (and a few other programs) to transfer it directly to your gps unit.
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Poul
May you enjoy peace and good health !
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