Thank you for your suggestion Catymag; so I just run JetMouse, enter the Navigation ID that comes in the "About" Screen of the GPS, hit the first generate button, and copy the "Software unlock code" into a new NotePad document (as is), which I would save as sw.unl in the Garmin folder of the copied SD card?
Note: I would delete the original gmapprom img & unl files from the SD card and copy the new unlocked map as gmapprom.img