Well if you want to view it in a GIS software then as you mentioned you need geocoding. So you need to export it in a format that is supported by ArcGIS. This is why I suggested Geo-Tiff. Another option would be KML.
See here for more ArcGIS supported formats.
You could also take a look at this discussion which suggests you could just import the .img and .data.
Do not forget to share what worked for you so others can benefit.