I think I found out how to check if new maps are available for your Lincoln.
Go here: https://syncnavigation.com/lincoln/home
Once there .....
Enter your vin number:
Enter your SYNC ESN number:
You can find your 8-character SYNC Serial Number (ESN) following these steps:
->Inside vehicle on SYNC screen
->Ignition is in “RUN” position and SYNC is active
->From the Home Screen, press "Settings"
->Under General Settings, select "About SYNC"
->Scroll down to display SYNC Serial Number (ESN)
Click the "Check available updates" button
If updates are available ................
Then choose how to order (and pay for) the updates
As of 12-28-19:
You can order a USB to be sent to your home for $149.00
You can download the updates and put them on your own USB for $109.00
The above pretty much addresses the how to determine if updates are available as well as how to acquire and pay for them.
But, I'm still a bit at sea as to how I apply the updates from the USB to the vehicle.
If anyone has done this, then I'd be grateful to hear how.