Why can't I delete things from SD card with BaseCamp?

Former Member
Former Member
I used BaseCamp to send some Birdseye images and tracks to the SD card in my Montana 600. Later I wanted to remove some of the tracks and images, but when I right-click them, Delete is not one of the options. I used Windows Explorer to delete the images I didn't want since they showed up as individual files but the tracks are all in one file. How can I delete them?