I have 3 530hcx the image must be in a garmin folder it cant read a card biger than 4g and some times the card has to be reset in its slot in the garmin . A image over 2g slows down the unit. my 530hcx will not load off a usb cable they will always error called garmin they said they are working on it and to load off card reader . I am loading the 24k not the 100k.