Problem Solved!
Contacted Garmin customer support via the web and got a clear and effective response. Even better, the method of uploading uses a USB stick and the port on the front of the unit, which makes way more sense than the method of burning a DVD shown in the manual.
Posted with Garmin's permission:
Dear Ron,
Thank you for contacting Garmin International. I can definitely help you with your question about the Jeep unit. Please use a USB stick and following these directions:
Step 1 - Download a POI database file from the web or create your own
Step 2 – Using POI Loader from Garmin (
www.garmin.com/products/poiloader) create the POI.gpi file from the database file you have gotten from the web or created
Step 3 – Save the POI.gpi file to your computer as a file
Step 4 – You will now need a USB Stick to load the custom POI to so that it can be loaded to the vehicle system. Create a folder on a blank USB stick entitled Garmin, example; if your USB Stick is listed as drive D by your computer, then the folder would be D:\Garmin
Step 5 – Create a folder within the Garmin folder named Poi, example; if your USB Stick is listed as drive D by your computer, then the folder would be D:\Garmin\Poi
Step 6 – Copy the POI.gpi file to the Garmin\Poi folder on the USB Stick, example; if your USB Stick is listed as drive D by your computer, then the file location would be D:\Garmin\Poi\POI.gpi
Step 7 – Insert the USB Stick to the radio and the Garmin navigation application will display a message that the custom POIs are ready to be copied, select yes.
Step 8 – To view the custom POI list select WhereTo, Extras, Custom POIs and you will see the list.
Worked like a charm for me.