this is a long thread with a lot of long posts (and a lot of long quotes) so I didn't read it all. I think what you are looking for is usb otg (on the go) which allows your tablet to act as a usb host. I am not sure exactly how to go into the file system on an android tablet, and you would need a cable. I feel like most tablets have usb otg nowadays, but yours might not. A GPS normally looks like a disk to a usb host.