I downloaded the Mac version of the iGO "Naviextras Toolbox" and installed it without any problems on my iMac.
I used a card reader to connect the toolbox to my NavNGo SD card and it was smooth sailing.
First, I learned that everything was up to date on the new card and the toolbox said there was nothing to update - software, maps, POIs or anything. The "History" function said my card has the following maps installed:
Map of USA and Canada 2021 Q4
mDealType9837729004 - title Expiration: 18 August 2023
By the way, you'll need to make an account a www.naviextras.com
and select Xite Solutions as your device type. An account is just an email address and password - they haven't asked for any other info.
I made a backup of the SD card via the tool box, but I have no idea where that was saved. It might be on the SD card, but I couldn't find it. And I don't see it on my computer. It's possible it was saved on the Naviextras server.
I wondered if the new SD card was keyed to my Xite core unit like the previous SD card was and it seems to be. My card info shows a unique device ID number.
Hope all this helps you folks. I take a month-long 2500 mi trip starting the day after labor day so that will be the first major use of the system.