Open the MapSource software on your computer. Click the "MapSetToolkit" button to open the importer.
The MapSource software lets you create and store your own maps for addresses and directions. The software imports any IMG file format so that you can edit maps from other programs such as Garmin IMG file format. After the IMG file imports into the MapSource software, you can edit the map or convert it to a new file format for your programs.
Click the "Select IMG" button and double-click the Garmin IMG file you want to import into your program. You can also select more than one IMG file by holding the "Ctrl" key and clicking each file or by clicking "Select All" to choose all files in the directory.
Click "Add" to add the selected IMG files. Click "Next." Leave the default values for the import process and click "Install In MapSource." The software compiles the list of map files and imports them into your MapSource workspace.