Hi guys. I downloaded a garmin img file for US inland lakes. I also downloaded the gimgunlock program and followed the instructions for unlocking (on a Mac - open the terminal window, then drag and drop the icon for the unlock program and the icon for the img file into it, then hit return). It ran the file but didn't create a new unlocked file - not sure if this is normal - just the same img file sitting there on my desktop. I created a folder named Garmin on my sd card and put the file in the folder. I plugged the card into my GPS (gpsmap 441s) but the unit didn't seem to see it as it made no difference on my maps. What did I do wrong? Any help is greatly appreciated!