Can anybody help me please. I downloaded a Zip file of maps to go on the Garmin Oregon and unzipped them , putting them on Desktop as an IMG file. I put in the micro SD card and a separate window opened ' Removable Disk F '. I dropped the IMG file in this , and it appeared to download into it okay. However , I cannot get the Oregen to recognise that there is even a mass storage device inside. Certainly it does not give me an option in the ssettings to use different maps. I am wondering if I have done anything wrong , or if the maps have failed to copy in correctly and therefore the Garmin has nothing to recognise ? HELP !