Hmmmm well I got the Ibycus map working on the Montana. I reformated the SD card while it was in the GPS and put the folder Garmin on it. I then copyied the CA-Central map in the folder and it did not work. I deleted the CA-Central map and copied the gmapsupp (Ibycus) in the folder. The map just show up on the main screen? It is not in the map menu or anything like I can't enable or disable cause it is not in the map menu. I'm good with that as that is all I wanted for now. Thanks for all the help. Just in time for hunting season hopefully put the GPS to good use. Thanks again everyone.