Hi all. In my 2015Greyhawk 31DS, I have the Clarion NX501 NAV/CD/DVD/ system and removed the "micro sd" card, used the Naviextras tool box and updated the system, which includes the map updates for free. I agree with greyhawk51, this took about an hour to update, and I know the maps got updated as it now shows the new Hwy exit near my place. I see on the Naviextras site you can buy additional maps if you want to. I believe the key to getting your free upgrades is built in to the firmware on the SD card when you register with Naviextras site. Cheers