It may be (it probably has a telnet login, etc) but a) I know next to zilch about unix and b) don't have the time. I just want to be able to copy a tree structure to it.
I used to own the Irex Iliad which, like most consumer gadgets of this type, runs a ripoff of Linux. Irex "generously" did allow 3rd party addons but you had to request a special "MAC code" from them to enable the installation; I requested this a number of times but it never came. This was just to install a replacement PDF reader which did not have the space-wasting buttons on the bottom, and which would have worked a lot better for Jepp plate aspect ratio. Never managed to do it, and sold the thing on Ebay.