I don't think they are supposed to be "open".

I see from the mywayfinder.com site that if you have a phone you are allowed to download their map files to PC for transfer to the phone, but the tablets aren't listed with the phones, and besides you need an ID/password that we don't have.

It would be nice if they added the tablets. I'll send an email to wayfinder suggesting it, but I don't hold much hope.