Accessory catalog for the '20 just added a Nav upgrade for existing hubs. Have to check with the dealer if it is backward compatible with the '19s with 8" screen radio. Looks like a simple SD card that plugs into the existing SD slot on the USB hub under the lid in the center console. Currently using the SD slot for music but could easily transfer it to a flash drive and use the SD slot for the maps. If compatible likely also requires a dealer programming for an hour labor.
Only thing that concerns me is the active subscription note.....a deal breaker if I have to pay for 4g to make the system work, but no problem if only subscription is necessary for updates and current traffic info. Anyone familiar with how this operates?
https://accessories.gm.com/applevalleychevy/product/2020/Chevrolet/Silverado 1500/navigation-system-conversion-kit-84489271?bac=113704&categoryId=12001