I have a 2006 Navigator with the optional navigation system.
I bought it used about 10 years ago.
I did find some CD updates on eBay. I bought those and updated to some future date. Something like 2010, maybe not even that far.
After that Ford did not support the system because there were newer systems in the newer vehicles.
For mapping, the road and highways are always changing or being added. A new subdivision is added and those streets are not in my navigation system and will never be there.
I live in AZ too, in the Phoenix area likely there will be multiple new subdivisions near the Loop 303 and West of I 17 because of the chip plant being built there. Those areas are going to show up on mapping program in my ride as traveling in open desert.
It is what it is when old software is replaced by newer systems.
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