I've just bought a Montana 650T, so I haven't yet been through any of the uploading maps etc.
My readings here are that the Garmin maps have an unlock code, or at least some versions or device versions do, which makes me wonder how is it that sellers on Ebay are advertising "Refurbished" Topo Australia maps V5(how do you refurbish a digital map? Polish the USB stick?) for $25. Do these have unlock codes.
I even read that it is the device itself that creates the security, one specifically saying Garmins made in 2015 won't accept some of these maps.
Anyone up to speed on how this all works?