Garmin Oregon 450 Micro SD Card in GPS technology and devices Posted July 1, 2014 Wrong answer, the oregon/dakota series accepts renamed maps, this is better anyway. Upload a map from Mapsource to the SD, rename this gmapsupp.img to yourownname.img, do so with all the maps you want on your gps (SD). Once you have an update from any map you only have to renew that map and not all the others with it. I know this is old but I just purchesed an Oregon 450 off E-bay and just installed a 32GB Sandisk Ultra class 10 uh1 card and no problems yet, I hope to load all Topo24k and NT Street maps if possible. see how she runs. I have the firmware updated to vers 6.