You can use ILWIS Map Import to import maps from Erdas file formats.

To start importing single maps:

* Open the File menu from the Main window and choose Import Map,

* Expand the Import/Export item in the Operation-tree and double-click the Import Map item, or

* Double-click the Import item in the Operation-list.

The Import Map dialog box will be opened:

* select the Import Format,

* select the file you wish to import,

* specify a name for the ILWIS output object(s) without extension.

Check ILWIS guide for more.